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P4 General Studies: Forces and Simple Machines (Paper 1 (basics))
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P4 General Studies: Forces and Simple Machines (Paper 1 (basics))
Paper one starts with pushes, pulls, weight and friction, then runs five basic sums on ramps, pulleys and levers.
Direct answers Work is force times distance, and every machine trades force for distance rather than saving work.
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: P4 General Studies: Forces and Simple Machines |
| Level | parts of a closed circuit, conductors against insulators, series against parallel, adding up battery voltage, and electrical safety |
02 Questions (10 items)
- FoundationA box is pushed with a horizontal force of 20 N over 5 m. How much work is done?
- FoundationA school bag has a mass of 3 kg. What is its weight? (take g as 10 N per kg)
- FoundationA fixed pulley lifts a 80 N load. What is the least effort needed?
- IntermediateA big crate is pushed with 100 N but does not move. What is the friction?
- IntermediateA ramp lifts a 200 N load through 1 m of height; the ramp is 5 m long. What effort is needed? (ignore friction)
- IntermediateA movable pulley lifts a 120 N load. What effort is needed in the ideal case?
- ChallengeOn a lever the load arm is 0.5 m and the effort arm is 2 m; the load is 80 N. What effort balances it?
- ChallengeA machine takes in 250 J and gives 200 J of useful work. What is its efficiency?
- ChallengeAn input of 400 J raises a 200 N load 1.5 m up a ramp. What is the efficiency?
- Error redoError clinic: heavy objects always fall faster than light ones. True?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 100 J. | Work is force times distance, so 20 N times 5 m gives 100 J. |
| 2 | 30 N. | Weight is mass times g, so 3 kg times 10 N per kg gives 30 N. |
| 3 | 80 N. | A fixed pulley only changes the direction of the effort and gives no force gain. |
| 4 | 100 N. | No motion means zero net force, so friction equals the push and points the other way. |
| 5 | 40 N. | The useful work of 200 J is spread over 5 m, so the effort is 40 N. |
| 6 | 60 N. | Two rope sections share the load, so the effort halves but the rope is pulled twice as far. |
| 7 | 20 N. | Equal moments: 80 N times 0.5 m is 40 N m, divided by 2 m gives 20 N. |
| 8 | 80.0 per cent. | Efficiency is useful work over input work, 200 over 250 gives 0.8, that is 80.0 per cent. |
| 9 | 75.0 per cent. | Useful work is 200 N times 1.5 m, that is 300 J, and 300 over 400 gives 75.0 per cent. |
| 10 | No. | Without air resistance all objects fall with the same acceleration; a heavier object has more weight but also more mass. |
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.
After paper one, take paper two and sort out series against parallel in one pass.Tutor Registration →
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