Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Work and Power
58 practice questions
Topics covered
Practice questions
31–40 of 58
Question 31
3 marks · Normal
Answer and see the solution →Explain, using the relationship for kinetic energy, why a small increase in speed leads to a much larger increase in kinetic energy.
Question 32
1 mark · Easy
Answer and check →Which of the following is the correct formula for calculating power?
- A.Power = Work done / Time taken
- B.Power = Mass × Acceleration
- C.Power = Distance / Time taken
- D.Power = Force × Distance
Question 33
1 mark · Easy
Answer and see the solution →State the SI unit of power.
Question 34
2 marks · Easy
Answer and see the solution →Give two examples of energy stores or forms between which energy is transferred when someone jumps off a diving board into a swimming pool.
Question 35
2 marks · Easy
Answer and see the solution →A bulb transfers 36 J of energy in 12 seconds. Calculate the power of the bulb.
Question 36
2 marks · Easy
Answer and see the solution →Explain what happens to the gravitational potential energy and kinetic energy of a ball as it rolls down a smooth slope.
Question 37
2 marks · Easy
Answer and see the solution →A boy pushes a trolley with a force of 50 N for a distance of 4 m. Calculate the work done by the boy on the trolley.
Question 38
2 marks · Easy
Answer and see the solution →Describe what is meant by the conservation of energy, using a bouncing ball as an example.
Question 39
4 marks · Normal
Answer and see the solution →A small electric motor raises a 2.0 kg mass vertically upwards a distance of 8.0 m in 6.0 s.
(a)[2 marks]Calculate the work done by the motor in raising the mass.
(b)[2 marks]Calculate the power output of the motor during this time.
Question 40
2 marks · Normal
Answer and see the solution →Explain why, as a rollercoaster descends from the highest point to the lowest, its gravitational potential energy decreases while its kinetic energy increases.