S1 Science: Forces, Motion And Simple Machines (Paper 2 (intermediate))

S1 Science: Forces, Motion and Simple Machines (Paper 2 (intermediate))

2026-11-14

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Tutor Prep Guide · Speed and acceleration calculations, Newton laws and friction, lever moments, mechanical advantage of pulleys and inclines, plus efficiency and stopping distance

S1 Science: Forces, Motion and Simple Machines (Paper 2 (intermediate))

This paper covers acceleration, work and power, the mechanical advantage of movable pulleys and pulley systems, and judging a zero resultant force.

Direct answers　Acceleration is the change in velocity over time, work is force times distance, mechanical advantage is load over effort, and rest means zero resultant force.

01　Paper details (check answers afterwards)

Item	Detail
Questions	10
Suggested time	20
Difficulty mix	Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1
Chapter	Chapter: S1 Science: Forces, Motion and Simple Machines
Level	S1

02　Questions (10 items)

FoundationA runner covers 120 m in 40 s. What is the average speed?
FoundationHow much force does an ideal movable pulley save?
FoundationWhat determines the size of friction?
IntermediateA bicycle speeds up from rest to 20 m/s in 4 s. What is its acceleration?
IntermediateWhat pull is needed to lift a 400 N load with an ideal movable pulley?
IntermediateA 50 N horizontal force pushes a box 4 m. How much work is done?
ChallengeA pulley system has a mechanical advantage of 3. What pull lifts a 900 N load?
Challenge200 J of work is done in 8 s. What is the power?
ChallengeA car at 25 m/s brakes at 5 m/s². How long does it take to stop?
Error redoA book rests on a table, so no force acts on it. Is this right?

03　Answers and one-line notes

#	Answer	One-line note
1	3 m/s	Average speed uses only total distance and total time, and 120 divided by 40 gives 3.
2	Half, a mechanical advantage of 2	The two rope sections share the load, so the pull is halved while the rope is pulled twice as far.
3	The roughness of the surfaces and the force pressing them together	The same shoe is harder to push on rough ground than on ice, and pressing harder raises friction too.
4	5 m/s²	Acceleration is the change in velocity over time, and 20 divided by 4 gives 5.
5	200 N	A movable pulley has a mechanical advantage of 2, and 400 divided by 2 gives 200.
6	200 J	Work is force times the distance along it, and 50 times 4 gives 200.
7	300 N	900 divided by 3 gives 300, and in return the rope is pulled three times as far.
8	25 W	Power is work divided by time, and 200 divided by 8 gives 25.
9	5 s	Divide the speed by the deceleration, and 25 divided by 5 gives 5.
10	No, gravity and the table normal force act on it and balance	Being at rest means the resultant force is zero, not that no force acts.

04　What to do after marking

After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
Repeat the same item two days later; move to the next paper only when both attempts are correct.
Parents only need the answer and note columns; there is no need to explain every item.

For mechanics questions ask three things: whether the question asks for force, energy or time, whether units are already in m, s and N, and whether equilibrium or constant work is the premise.Tutor Registration →

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