Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Energy Resources and Energy Transfers
175 practice questions
Topics covered
Practice questions
31–40 of 90 · Normal
Question 31
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 32
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 33
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 34
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 35
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 36
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.
Question 37
1 mark · Normal
Answer and check →Which statement best describes the unit of power?
- A.One joule transferred per second
- B.One newton per second
- C.One metre per second
- D.One kilogram per second
Question 38
3 marks · Normal
Answer and see the solution →A lift with passengers has a combined weight of 3500 N. The lift rises vertically at a constant speed of 2.5 m/s.
(a)[1 mark]State the upward force needed to keep the lift moving at constant speed.
(b)[2 marks]Calculate the power output of the lift motor.
Question 39
1 mark · Normal
Answer and see the solution →State the formula relating power, work done (or energy transferred), and time.
Question 40
3 marks · Normal
Answer and see the solution →A student with a mass of 60 kg runs up a flight of stairs in 9.0 s. The stairs have 12 steps, each 0.25 m high. Use g = 10 N/kg.