Quick answer: Work is the energy transferred when a force moves an object, found from W = F × d and measured in joules. This Physics 9-10 test on work and power has 8 questions worth 20 marks, to do in 40 minutes: equations, pushing a mower and motorcycle. The mark scheme is on a separate page; free printable PDF.
This test covers work, power, kinetic energy and gravitational potential energy. Write the equation, show the substitution and give units. Use g = 9.8 N/kg. Calculators are allowed. The total is 20 marks.
Level: Physics grades 9-10 (GCSE · IGCSE · O Level · Class 9-10) · Curriculum: HS-PS3-1
Question 1 Equations (2 marks)
Write each equation in symbols.- The power developed when work W is done in time t. (1 mark)
- The gravitational potential energy gained by a mass m raised through height h. (1 mark)
Question 2 Pushing a mower (3 marks)
Wanjiru pushes a lawnmower with a force of 80 N through 25 m in 40 s.- Calculate the work done. (1 mark)
- Calculate the power. (2 marks)
Question 3 Motorcycle (3 marks)
A motorcycle of mass 220 kg moves at 15 m/s.- Calculate its kinetic energy. (2 marks)
- State its kinetic energy at 30 m/s. (1 mark)
Question 4 Ball thrown upwards (2 marks)
A ball of mass 0.20 kg rises to a height of 6.0 m. Use g = 9.8 N/kg. Calculate the gain in gravitational potential energy. (2 marks)Question 5 Stretching a spring (3 marks)
- Calculate the work done in stretching the spring by 0.50 m. (2 marks)
- State what the area under the graph represents. (1 mark)
Question 6 Stopping distance (4 marks)
A car of mass 900 kg moves at 10 m/s. The brakes apply a constant force of 3000 N.- Calculate the kinetic energy of the car. (2 marks)
- Calculate the distance in which the car stops. (2 marks)
Question 7 Carrying a bag (2 marks)
A student carries a heavy bag along a level corridor at constant speed. Explain why the upward force on the bag does no work. (2 marks)Question 8 Unit of power (1 mark)
State the unit of power in terms of joules and seconds. (1 mark)
