Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Energy Resources and Energy Transfers
175 practice questions
Topics covered
Practice questions
61–70 of 175
Question 61
4 marks · Normal
Answer and see the solution →A student drops a metal ball bearing (mass 0.15 kg) from rest at a height of 2.5 m above the ground. Ignore air resistance.
(a)[2 marks]Calculate the gravitational potential energy of the ball bearing at the top.
(b)[1 mark]State the value of kinetic energy just before the ball hits the ground.
(c)[1 mark]Explain your reasoning.
Question 62
3 marks · Normal
Answer and see the solution →A small meteor enters Earth's atmosphere and burns up as a shooting star. It had a large kinetic energy on entry.
Question 63
1 mark · Normal
Answer and check →Which of the following objects has the greatest kinetic energy?
- A.A 50 kg child running at 4 m/s
- B.A 10 kg bicycle moving at 12 m/s
- C.A 1 kg ball thrown at 20 m/s
- D.A 70 kg adult jogging at 2 m/s
Question 64
3 marks · Normal
Answer and see the solution →A golf ball (mass 0.045 kg) leaves the club at a speed of 38 m/s.
(a)[3 marks]Calculate the kinetic energy of the golf ball.
Question 65
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 66
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 67
1 mark · Easy
Answer and see the solution →State the SI unit of power.
Question 68
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 69
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 70
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.