2. REVISION

4. What force keeps the satellite orbiting the Earth.? (1)

5. Why is the Moon’s speed constant but it's velocity changing (2)

6. Calculate the work done climbing the stairs (explain your answer) Weight = 50 N Height 3 m

7. A lift goes up two floors, each 3m high in 10 seconds Calculate the power. Load = 2000N

8. Will the car speed up / slow down / or travel at constant speed ? (1) 600 N

9. How does the speed of falling objects change as they fall? (2)?

10. Name two advantages of hybrid cars over cars with only petrol engines

11. Will the car speed up / slow down / or travel at constant speed ? (1) 750 N600 N

12. B A C D Where is PE increasing ?

13. Describe how the forces change during a fall (before the parachute opens) (3)

14. B A C D Where is KE increasing and PE decreasing ?

15. Explain how air bags reduce accidents? (3)

16. Explain how ABS works.

17. B A C D Where as the car got the most KE – Explain your answer ?

18. Some cars run on biofuel. Name an advantage and disadvantage of this fuel and what type of emissions does it reduce? ?

19. What will the effect of doubling the mass of a vehicle have on its KE and what will the effect of doubling its speed have? 2000 Kg 4000kg 10 m/s 20 m/s

20. Both have the same engine and mass. So why does the car use less petrol if driven in the same manner