Why do objects fall towards the ground when released? Earth exerts a gravitational force on objects. That force acts towards Earth and gives an object weight. When an unsupported object is released and gravity is the dominant unbalanced force, its motion changes downward.
Gravity does not switch on only when an object starts moving. Earth exerts gravitational force on a book resting on a table as well. The table provides an upward support force, so the book can remain at rest when the forces are balanced. Remove the support and the motion can change.
At eduKate Sengkang, Primary 6 Science tuition separates gravity, weight, mass, support and motion. Students learn to draw force relationships, avoid saying that heavier always falls faster, and use the exact conditions of a falling or supported-object question rather than treating ‘gravity pulls down’ as a complete answer.
Use the Primary 6 Science Learning Hub, the Mass, Weight and Gravitational Force guide, and Why Does a Bouncing Ball Lose Height?.
- Up to three students per class.
- 1.5-hour weekly lesson.
- Focus: gravitational force, weight, falling motion, support forces, diagrams, fair tests and PSLE explanation.
- Location: 83 Punggol Central, Singapore 828761.
- Enquiries: WhatsApp +65 8823 1234.
Gravitational Force
Earth exerts gravitational force on objects near its surface.
The force acts even when the object is not moving.
Students stop using motion as proof that gravity exists.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Weight
Weight is the gravitational force acting on an object.
Mass and weight are related but are not the same quantity.
The learner uses weight when discussing gravitational force rather than calling mass a force.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Mass
Mass describes the amount of matter in an object and is measured differently from weight.
A larger mass usually means greater weight under the same gravitational conditions, but mass itself is not a force.
This distinction prevents unit and concept errors.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Direction of Gravity
Near Earth’s surface, gravitational force acts towards Earth.
An object thrown upward is still pulled downward while moving up.
Students learn that force direction and motion direction can differ.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Supported Objects
A table can exert an upward support force on a resting object.
The presence of gravity does not require the object to be moving downward if forces are balanced.
This explains why a book on a desk can have weight and remain stationary.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Release
When support is removed, the upward support force disappears and gravity can become the dominant unbalanced force.
The object does not fall because it ‘wants’ to return to Earth.
Students connect changed force balance to changed motion.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Falling Motion
A falling object’s downward speed can increase when gravitational force causes downward acceleration.
Primary answers need not use advanced equations to explain that the motion changes.
The mechanism is force changing motion, not gravity giving a fixed speed.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Thrown Upward
A ball moving upward still experiences gravitational force downward.
Its upward speed decreases until the vertical motion momentarily stops, then it falls.
This is a key misconception check.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Highest Point
At the top of a vertical throw or bounce, vertical speed is momentarily zero but gravity still acts.
Zero speed does not mean zero force.
Students separate motion state from force state.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Heavier Objects
A heavier object has greater weight under the same gravitational conditions.
Falling speed in air cannot be predicted from mass alone because shape and interaction with the surroundings can also matter.
This prevents the simplistic ‘heavier always falls faster’ rule.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Shape
Objects with different shapes can interact differently with the air while falling.
The Primary 6 force syllabus does not require specific advanced fluid-dynamics terms to reason that additional forces can affect motion.
Students identify that a mass comparison is unfair if shape also changes.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Dropping From Different Heights
An object dropped from a greater height has more time to change its motion before reaching the ground, under the simple model.
Height and mass are different variables and should not be changed together in a fair test.
Students separate release condition from object property.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Support Force
A hand, string, shelf or table can provide forces that prevent or alter falling.
The exact support force depends on the arrangement.
Students inspect the system rather than assuming gravity is the only force whenever an object is above ground.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Gravity on the Moon
Gravity also acts on objects on the Moon, but its strength differs from Earth’s.
Primary students should not infer that no air means no gravity.
This separates gravitational force from atmospheric effects.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Weight Measurement
A spring balance can measure force in suitable school contexts.
A balance reading must be interpreted according to the instrument and conditions.
Students avoid treating every scale number as mass without checking units.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Force Diagrams
Force arrows can represent gravity and support forces.
Arrow direction should follow the physical interaction, not the convenient empty space on the page.
Students use diagrams to make force relationships visible.
In a 3-pax tutorial, each learner first commits to an explanation independently. The tutor can then identify whether the difficulty comes from the concept, the evidence, the representation or the final wording. A changed example is used afterwards so the student must rebuild the reasoning rather than copy a model sentence.
Worked Questions and Transfer Cases
Book on Table
A book rests on a table.
Gravity acts downward and the table provides an upward support force. The book can remain at rest when these forces are balanced.
A useful follow-up changes one condition while preserving the others. The learner must decide which part of the first explanation remains valid, which part changes, and what new evidence would be needed. This keeps the method transferable instead of tying it to one diagram.
Book Pushed Off Table
The book moves beyond the edge and loses the table’s support.
Gravity becomes an unbalanced downward force and the book falls.
A useful follow-up changes one condition while preserving the others. The learner must decide which part of the first explanation remains valid, which part changes, and what new evidence would be needed. This keeps the method transferable instead of tying it to one diagram.
Ball Dropped
A ball is released from rest.
Gravity acts downward and changes its motion so it accelerates towards Earth.
A useful follow-up changes one condition while preserving the others. The learner must decide which part of the first explanation remains valid, which part changes, and what new evidence would be needed. This keeps the method transferable instead of tying it to one diagram.
Ball Thrown Upward
A ball moves upward after being thrown.
Gravity still acts downward, slowing the upward motion until the ball reaches a highest point.
A useful follow-up changes one condition while preserving the others. The learner must decide which part of the first explanation remains valid, which part changes, and what new evidence would be needed. This keeps the method transferable instead of tying it to one diagram.
Highest Point
The ball is momentarily not moving vertically.
Gravity still acts; the momentary zero speed is not a force-free condition.
A useful follow-up changes one condition while preserving the others. The learner must decide which part of the first explanation remains valid, which part changes, and what new evidence would be needed. This keeps the method transferable instead of tying it to one diagram.
Heavy and Light Balls
Two balls have different masses and shapes.
The heavier ball has greater weight, but a fair claim about falling speed requires control of other factors such as shape and release.
A useful follow-up changes one condition while preserving the others. The learner must decide which part of the first explanation remains valid, which part changes, and what new evidence would be needed. This keeps the method transferable instead of tying it to one diagram.
Paper and Crumpled Paper
A flat sheet and crumpled sheet have the same mass but different shapes.
Different falling behaviour shows that shape and interaction with the air can matter even when mass is held constant.
A useful follow-up changes one condition while preserving the others. The learner must decide which part of the first explanation remains valid, which part changes, and what new evidence would be needed. This keeps the method transferable instead of tying it to one diagram.
Object Hanging From String
A mass hangs stationary from a string.
Gravity acts downward while the string provides an upward tension force; the object can remain at rest.
A useful follow-up changes one condition while preserving the others. The learner must decide which part of the first explanation remains valid, which part changes, and what new evidence would be needed. This keeps the method transferable instead of tying it to one diagram.
Object on Slope
A block rests on a slope.
Gravity acts toward Earth, while support and possibly friction from the slope affect whether the block moves.
A useful follow-up changes one condition while preserving the others. The learner must decide which part of the first explanation remains valid, which part changes, and what new evidence would be needed. This keeps the method transferable instead of tying it to one diagram.
Spring Balance
An object is suspended from a spring balance.
The reading can represent the force associated with the object’s weight when used properly.
A useful follow-up changes one condition while preserving the others. The learner must decide which part of the first explanation remains valid, which part changes, and what new evidence would be needed. This keeps the method transferable instead of tying it to one diagram.
Different Drop Heights
The same ball is dropped from two heights.
The release height changes the time and motion before impact; the test is not a mass comparison.
A useful follow-up changes one condition while preserving the others. The learner must decide which part of the first explanation remains valid, which part changes, and what new evidence would be needed. This keeps the method transferable instead of tying it to one diagram.
Moon Scenario
A written question places an object on the Moon.
The object still experiences gravitational force, although the strength differs from Earth. Lack of air does not mean lack of gravity.
A useful follow-up changes one condition while preserving the others. The learner must decide which part of the first explanation remains valid, which part changes, and what new evidence would be needed. This keeps the method transferable instead of tying it to one diagram.
A Safe Investigation or Observation Route
Use small lightweight objects and teacher-approved drop heights over a clear floor area. Never drop objects from windows, balconies, stairs or overhead positions.
If comparing masses, keep shape and release height as similar as practical. If comparing shape, keep mass and material as similar as practical where possible.
Release rather than throw the objects unless the investigation specifically studies an added push.
Video or supplied data can replace physical dropping when the environment is unsuitable.
How We Build the Open-Ended Explanation
Identify every force acting on the object, not just gravity. Ask whether the object is supported, held, suspended or free.
State that gravitational force acts towards Earth and gives the object weight.
Decide whether another force balances or opposes gravity. If support is removed and gravity is unbalanced, explain the resulting change in motion.
Keep mass, weight and speed separate. A larger weight does not automatically prove a faster fall in every real-air comparison.
Why 3-Pax Tutorials Help
Three students are enough for useful comparison without allowing a learner to disappear inside a large class. Each student can predict, explain and correct.
Peer answers are used as evidence to examine reasoning, not as substitutes for independent thinking. Students are asked which condition or scientific relationship makes an answer defensible.
The lesson ends with independent transfer. The student must use the same concept in a changed context without relying on the original wording.
Common Errors
- Gravity acts only when objects are falling.
- An object at the highest point has no gravity.
- Mass and weight are the same quantity.
- Heavier always means faster fall.
- Objects fall because they ‘want’ to go down.
- A table prevents gravity from acting.
- No air means no gravity.
- Force direction is assumed to match motion direction.
Each error has a different repair. A concept error needs teaching; an evidence error needs a reading routine; an incomplete explanation needs link-building; and an unfair-test error needs experimental redesign. Calling every mistake careless would hide the work that actually needs to be done.
Bouncing Ball
Gravity acts during both upward and downward flight, while the collision changes the motion at the floor. This links to the bouncing-ball owner.
The transfer task is useful only when the student preserves the core mechanism and also notices the new boundary. Strong Science is not the ability to repeat one rule everywhere; it is the ability to know when the rule applies, what evidence supports it and when more information is needed.
Parachute
A parachute changes the interaction with the surrounding air, so falling motion cannot be explained by gravity alone. The official Primary syllabus does not require the specific term air resistance for every answer, but students can recognise an additional opposing force.
The transfer task is useful only when the student preserves the core mechanism and also notices the new boundary. Strong Science is not the ability to repeat one rule everywhere; it is the ability to know when the rule applies, what evidence supports it and when more information is needed.
Satellite Misconception
Objects in orbit are not beyond gravity. Orbital motion involves gravitational attraction; Primary students need not calculate it, but should avoid the idea that space means zero gravity everywhere.
The transfer task is useful only when the student preserves the core mechanism and also notices the new boundary. Strong Science is not the ability to repeat one rule everywhere; it is the ability to know when the rule applies, what evidence supports it and when more information is needed.
Elevator and Support
A person standing in a lift experiences gravity and a support force from the floor. The exact balance can change if the lift accelerates.
The transfer task is useful only when the student preserves the core mechanism and also notices the new boundary. Strong Science is not the ability to repeat one rule everywhere; it is the ability to know when the rule applies, what evidence supports it and when more information is needed.
Falling Leaf
A leaf can fall slowly because other forces and its shape affect motion. Mass alone does not determine the observed speed.
The transfer task is useful only when the student preserves the core mechanism and also notices the new boundary. Strong Science is not the ability to repeat one rule everywhere; it is the ability to know when the rule applies, what evidence supports it and when more information is needed.
Force Versus Motion
An object can move upward while the net force is downward, as in a thrown ball. This is a powerful transfer case for separating velocity direction from force direction.
The transfer task is useful only when the student preserves the core mechanism and also notices the new boundary. Strong Science is not the ability to repeat one rule everywhere; it is the ability to know when the rule applies, what evidence supports it and when more information is needed.
What Progress Looks Like
The learner recognises gravity on both moving and stationary objects.
Mass and weight are used distinctly and with correct conceptual roles.
Support forces are included when objects rest on surfaces or hang from strings.
Changed examples such as upward motion and the Moon are solved without saying gravity has switched off.
Frequently Asked Questions
Why do objects fall?
Earth’s gravitational force acts on them. When they are unsupported and gravity is unbalanced, their motion changes downward.
Does gravity act on a book on a table?
Yes. The table also provides an upward support force, so the book can remain at rest.
Is weight the same as mass?
No. Weight is the gravitational force acting on an object; mass is not a force.
Does gravity stop when a ball reaches its highest point?
No. Gravity still acts downward even though vertical speed is momentarily zero.
Do heavier objects always fall faster?
Not as a universal real-air rule. Shape and other forces can affect motion.
Is there gravity on the Moon?
Yes. The Moon exerts gravitational force, although its strength differs from Earth’s.
Does this replace the whole Forces topic?
No. It owns the focused gravity-and-falling question. Use the Primary 6 Science Learning Hub for friction, spring force and integrated force questions.
Primary 6 Gravity Checklist
- What object am I analysing?
- What forces act on it?
- Which direction does gravity act?
- Is there a support or tension force?
- Are the forces balanced or unbalanced?
- Am I confusing mass with weight?
- Am I assuming force direction equals motion direction?
- Did the comparison change shape, height or another factor as well as mass?
Use the Primary 6 Science Learning Hub, the Mass, Weight and Gravitational Force guide, and Why Does a Bouncing Ball Lose Height?.
eduKate Sengkang teaches Primary Science in focused groups of up to three students. Lessons are by appointment. For current class availability, WhatsApp +65 8823 1234.
Properly Taught Kids Shine a Bright Light Into the Future.
Evidence Before Explanation
Students should be able to point to the exact clue, measurement, diagram feature or stated condition that supports the answer. A scientifically familiar statement can still be irrelevant when it is not connected to the question evidence. This habit becomes increasingly valuable as Primary Science questions become more integrated.
Applied to gravity, weight and falling motion, the learner must keep the exact conditions visible and resist replacing the specific evidence with a memorised chapter slogan. The final sentence should communicate the relationship cleanly and stop once the scientific job is complete.
Delayed Retrieval
The concept returns after several days in a different representation. The learner attempts before reopening notes, explains any uncertainty and then checks the answer. This reveals whether the knowledge is becoming durable or whether it was only familiar immediately after teaching.
Applied to gravity, weight and falling motion, the learner must keep the exact conditions visible and resist replacing the specific evidence with a memorised chapter slogan. The final sentence should communicate the relationship cleanly and stop once the scientific job is complete.
From Guided Work to Independence
Early examples can contain prompts, labels and partially completed explanations. Those supports are removed progressively. A strong learner eventually identifies the target, retrieves the concept, uses the evidence and checks the final answer without waiting for a tutor to supply the next step.
Applied to gravity, weight and falling motion, the learner must keep the exact conditions visible and resist replacing the specific evidence with a memorised chapter slogan. The final sentence should communicate the relationship cleanly and stop once the scientific job is complete.
Parent-Friendly Review
Parents do not need to reteach the topic. Ask the child what the question wanted, which evidence mattered, what scientific relationship explained it and why the corrected answer is stronger. A short explanation from memory can reveal more than another round of passive rereading.
Applied to gravity, weight and falling motion, the learner must keep the exact conditions visible and resist replacing the specific evidence with a memorised chapter slogan. The final sentence should communicate the relationship cleanly and stop once the scientific job is complete.
Exam Transfer
Mixed questions remove the chapter label. The student must decide which concept applies before answering. This selection step is a hidden part of examination mastery and should be practised before full-paper pressure is introduced.
Applied to gravity, weight and falling motion, the learner must keep the exact conditions visible and resist replacing the specific evidence with a memorised chapter slogan. The final sentence should communicate the relationship cleanly and stop once the scientific job is complete.
Evidence Before Explanation 2
Students should be able to point to the exact clue, measurement, diagram feature or stated condition that supports the answer. A scientifically familiar statement can still be irrelevant when it is not connected to the question evidence. This habit becomes increasingly valuable as Primary Science questions become more integrated.
Applied to gravity, weight and falling motion, the learner must keep the exact conditions visible and resist replacing the specific evidence with a memorised chapter slogan. The final sentence should communicate the relationship cleanly and stop once the scientific job is complete.
Delayed Retrieval 2
The concept returns after several days in a different representation. The learner attempts before reopening notes, explains any uncertainty and then checks the answer. This reveals whether the knowledge is becoming durable or whether it was only familiar immediately after teaching.
Applied to gravity, weight and falling motion, the learner must keep the exact conditions visible and resist replacing the specific evidence with a memorised chapter slogan. The final sentence should communicate the relationship cleanly and stop once the scientific job is complete.
From Guided Work to Independence 2
Early examples can contain prompts, labels and partially completed explanations. Those supports are removed progressively. A strong learner eventually identifies the target, retrieves the concept, uses the evidence and checks the final answer without waiting for a tutor to supply the next step.
Applied to gravity, weight and falling motion, the learner must keep the exact conditions visible and resist replacing the specific evidence with a memorised chapter slogan. The final sentence should communicate the relationship cleanly and stop once the scientific job is complete.
Parent-Friendly Review 2
Parents do not need to reteach the topic. Ask the child what the question wanted, which evidence mattered, what scientific relationship explained it and why the corrected answer is stronger. A short explanation from memory can reveal more than another round of passive rereading.
Applied to gravity, weight and falling motion, the learner must keep the exact conditions visible and resist replacing the specific evidence with a memorised chapter slogan. The final sentence should communicate the relationship cleanly and stop once the scientific job is complete.
Exam Transfer 2
Mixed questions remove the chapter label. The student must decide which concept applies before answering. This selection step is a hidden part of examination mastery and should be practised before full-paper pressure is introduced.
Applied to gravity, weight and falling motion, the learner must keep the exact conditions visible and resist replacing the specific evidence with a memorised chapter slogan. The final sentence should communicate the relationship cleanly and stop once the scientific job is complete.
Evidence Before Explanation 3
Students should be able to point to the exact clue, measurement, diagram feature or stated condition that supports the answer. A scientifically familiar statement can still be irrelevant when it is not connected to the question evidence. This habit becomes increasingly valuable as Primary Science questions become more integrated.
Applied to gravity, weight and falling motion, the learner must keep the exact conditions visible and resist replacing the specific evidence with a memorised chapter slogan. The final sentence should communicate the relationship cleanly and stop once the scientific job is complete.
Delayed Retrieval 3
The concept returns after several days in a different representation. The learner attempts before reopening notes, explains any uncertainty and then checks the answer. This reveals whether the knowledge is becoming durable or whether it was only familiar immediately after teaching.
Applied to gravity, weight and falling motion, the learner must keep the exact conditions visible and resist replacing the specific evidence with a memorised chapter slogan. The final sentence should communicate the relationship cleanly and stop once the scientific job is complete.
