Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Work and Power
58 practice questions
Topics covered
Practice questions
21–30 of 58
Question 21
1 mark · Easy
Answer and see the solution →Name the energy store that increases when an object is moved upwards away from the ground.
Question 22
2 marks · Easy
Answer and see the solution →A toy of mass 0.5 kg is lifted from the floor onto a table 0.8 m high. Calculate the increase in gravitational potential energy. Take .
Question 23
2 marks · Easy
Answer and see the solution →Describe what happens to the energy stores of a ball when it is dropped from a height until it comes to rest on the ground.
Question 24
3 marks · Normal
Answer and see the solution →A tennis ball of mass 0.060 kg is thrown horizontally at a speed of 18 m/s.
(a)[3 marks]Calculate the kinetic energy of the ball.
Question 25
4 marks · Normal
Answer and see the solution →A car of mass 1100 kg is travelling at 20 m/s on a motorway.
(a)[2 marks]Calculate the kinetic energy of the car.
(b)[2 marks]Explain what happens to this energy if the car brakes to a stop.
Question 26
3 marks · Normal
Answer and see the solution →A football of mass 0.45 kg is moving at 12 m/s towards a goal.
(a)[3 marks]Calculate its kinetic energy.
Question 27
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 28
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 29
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 30
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.