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Printable Physics practice

Six original questions. Worked answers start on a separate page.

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Each set number reproduces the same questions. For classroom display or interactive checking, open a question’s practice link.

Treat the given values as exact unless an uncertainty is stated.

Forces, energy and momentum

Set 42 · Original PhysicsHelp questions · Selected AQA 7408 / OCR A H556 skills

Question 1

A force of 62 N acts at 40° above the positive horizontal direction. Find the magnitude of its horizontal component. Give your answer to 3 significant figures.

xy40°62 N
62 N force at 40° above positive horizontal. Dashed projections show perpendicular components; the arrow shows the force direction.

forces-equilibrium / horizontal-component / v1.0.0 / seed 42 · Check interactively

Question 2

A light horizontal beam is pivoted at its centre. A downward 57 N load acts 0.4 m to the left. What downward force 0.3 m to the right balances its moment? Ignore the beam’s weight. Give your answer to 3 significant figures.

57 NF?0.4 m0.3 m
Downward loads to either side of the pivot: 57 N 0.4 m left, unknown force 0.3 m right; schematic.

forces-equilibrium / balance / v1.0.0 / seed 104771 · Check interactively

Question 3

A constant 26 N force pulls an object through a horizontal displacement of 5 m. The force is 60° above the displacement direction. Find the work done by this force. Give your answer to 3 significant figures.

energy-momentum / angled-work / v1.0.0 / seed 209500 · Check interactively

Question 4

A motor raises a 42 kg load through 3 m in 8 s at constant speed. Use g = 9.81 m s⁻². Find the useful average lifting power. Give your answer to 3 significant figures.

energy-momentum / lifting-power / v1.0.0 / seed 314229 · Check interactively

Question 5

On a horizontal track, a 4 kg trolley at +7 m s⁻¹ collides with a 5 kg trolley at -1 m s⁻¹. They stick together. External horizontal impulse is negligible. Find their signed common velocity. Give your answer to 3 significant figures.

energy-momentum / inelastic-collision / v1.0.0 / seed 418958 · Check interactively

Question 6

A 0.4 kg ball changes velocity from +10 to -2 m s⁻¹ during contact lasting 0.04 s. Positive is the initial direction. Find the signed impulse on the ball. Give your answer to 3 significant figures.

energy-momentum / rebound-impulse / v1.0.0 / seed 523687 · Check interactively

Worked answers — Forces, energy and momentum

Set 42. Keep intermediate values unrounded. The stated practice checks accept values rounding to 3 significant figures.

Question 1

  1. Fx = 62 × cos(40°) N.
  2. Answer: 47.5 N (3 significant figures).

Question 2

  1. 57 × 0.4 = F_right × 0.3.
  2. F_right = 57 × 0.4/0.3 N.
  3. Answer: 76.0 N (3 significant figures).

Question 3

  1. W = 26 × 5 × cos(60°) J.
  2. Answer: 65.0 J (3 significant figures).

Question 4

  1. ΔE_p = 42 × 9.81 × 3 J.
  2. Useful power = (42 × 9.81 × 3)/8 W.
  3. Answer: 155 W (3 significant figures).

Question 5

  1. (4+5)v = 4 × 7 + 5 × (-1).
  2. v = (23)/(9) m s⁻¹.
  3. Answer: 2.56 m s⁻¹ (3 significant figures).

Question 6

  1. Impulse = 0.4 × (-2 − 10) = -4.8 N s.
  2. Answer: -4.80 N s (3 significant figures).