A-Level UK (AQA, Edexcel, OCR) · Physics

Mechanics and materials

17 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 17 questions

  1. Two perpendicular forces of 6.0 N and 8.0 N act on an object at a point. What is the size of the resultant force?
  2. A ball is launched at 20 m/s at 30 degrees above the horizontal from level ground (g = 9.81 m/s2, no air resistance). What is its horizontal range?
  3. A skydiver reaches terminal velocity. What is true at this point?
  4. A 0.15 kg ball hits a wall at 20 m/s and rebounds at 15 m/s. What is the magnitude of the impulse on the ball?
  5. A 3.0 kg trolley moving at 2.0 m/s collides with a stationary 1.0 kg trolley and they stick together. How much kinetic energy is lost?
  6. A 50 N force acts at 60 degrees to the direction of travel and moves an object 4.0 m. How much work does it do?
  7. A car's engine delivers 25 kW at a steady 20 m/s. What is the resistive force?
  8. A motor of input power 400 W lifts a 50 kg load through 3.0 m in 5.0 s (g = 9.81 m/s2). What is the efficiency?
  9. A ball is dropped from 1.8 m and falls freely (g = 9.81 m/s2). What is its speed just before it lands?
  10. Under a load of 50 N, a wire of original length 2.0 m and cross-sectional area 1.0 x 10^-6 m2 extends by 1.0 mm. What is the Young modulus of the material?
  11. A spring of constant 250 N/m is stretched by 4.0 cm. How much elastic potential energy is stored?
  12. What does the area under a force-extension graph for a spring represent?
  13. Water leaves a hose at 0.50 kg/s with speed 8.0 m/s and hits a wall, stopping completely. What force does it exert on the wall?
  14. A spanner of length 1.5 m is pushed perpendicular to its length with a force of 80 N at the end. What is the torque?
  15. A car's speed doubles. Assuming constant deceleration, how does its braking distance change?
  16. Two identical springs, each of spring constant 200 N/m, are joined end to end in series. What is the combined spring constant?
  17. Which expression gives the newton in SI base units?

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