Olibits / Science / Forces & Motion Enrichment
Primary 6 Science: Forces & Motion Enrichment Practice
Real Primary 6 Science questions on Forces & Motion Enrichment, pulled directly from the Olibits question bank — the same questions a child would actually see, not separately written for this page.
Curriculum alignment
Science Teaching & Learning Syllabus, Primary Three to Six (MOE, 2023 syllabus)
Science is not a taught subject at P1/P2 under MOE's own syllabus — our P1/P2 Science content is offered as enrichment beyond the official syllabus, not as a claim of syllabus coverage at those grades.
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Enrichment topic. This goes beyond what the MOE syllabus asks at this level. It is offered as extra practice, not as syllabus coverage.
Real Forces & Motion Enrichment practice questions
Two identical toy cars, one empty and one loaded with sand, are each pushed on a smooth floor with the same 10 N force. Which car speeds up more, and why?
The empty car, because the same force changes the motion of a lighter car more ✓
The loaded car, because a heavier car has more force acting on it
Neither car, because the same force always gives the same change in motion, whatever the mass
The loaded car, because a heavier car always moves faster
For the same size of force, an object with less mass speeds up more than an object with more mass; since the empty car has less mass than the sand-loaded car, the same 10 N push causes it to speed up more.
A car travelling fast needs a much longer distance to stop safely than the same car travelling slowly, even when the driver applies the same braking force in both cases. Using force ideas, explain why.
A faster car has less mass, so the same braking force is less able to stop it
A faster car has more speed to lose, so the same braking force needs a longer distance to stop it ✓
The brakes give less force at high speed, so they need more distance to stop the car
Friction between the tyres and the road disappears at high speed, so the brakes have nothing to grip
The same braking force removes speed at roughly the same rate each moment, but a faster car has more speed that needs to be brought down to zero, so it takes longer for the brakes to stop it, during which the car keeps travelling forward, resulting in a longer stopping distance.
A small motorboat's engine pushes it forward, but a strong river current pushes it sideways at the same time. The boat ends up travelling in a diagonal path instead of straight across the river or straight downstream. Which explanation best fits this?
Only the engine force affects the boat's path, and the current force has no effect
Only the current force affects the boat's path, and the engine force has no effect
The engine force and the current force cancel out completely, so the boat does not move at all
The boat's path is the combined result of the engine force and the current force acting on it together ✓
When two forces act on an object in different directions at the same time, neither force alone determines its path; instead, the object moves in a combined direction shaped by both forces together, which is why the boat drifts diagonally rather than following either force's direction exactly.
Playgrounds often use soft rubber matting instead of hard concrete underneath climbing frames. Using ideas about force, explain why this makes falls less painful for children.
Soft rubber reduces the pull of gravity near the ground, so children fall more slowly
Soft rubber has more friction than concrete, so children slide to a stop more gently
Soft rubber stops the fall more quickly than concrete, so there is less force on the child
Soft rubber squashes on landing and spreads the stopping force over a longer time ✓
When landing on hard concrete, the fall is stopped very suddenly, delivering the full force of the impact almost instantly. Soft rubber matting compresses on landing, cushioning the fall and spreading the same stopping effect over a slightly longer time, which reduces how sharply the impact force is felt.