Grade 7 Motion & energy worksheet

What is on the worksheet

1. An object moves at constant velocity -8 m/s for 30 s. Find displacement in m.

2. An object moves at constant velocity -8 m/s for 36 s. Find displacement in m.

3. A device receives 4300 J and delivers 3010 J of useful energy. Find its efficiency as a percentage.

4. A force of 12 N acts along a displacement of 3 m. Calculate the work in J.

5. A device receives 5900 J and delivers 1180 J of useful energy. Find its efficiency as a percentage.

6. A device receives 3400 J and delivers 1360 J of useful energy. Find its efficiency as a percentage.

7. An object moves at constant velocity -8 m/s for 4 s. Find displacement in m.

8. A device receives 900 J and delivers 45 J of useful energy. Find its efficiency as a percentage.

9. An object moves at constant velocity -10 m/s for 6 s. Find displacement in m.

10. An object moves at constant velocity 3 m/s for 20 s. Find displacement in m.

11. A device receives 4200 J and delivers 420 J of useful energy. Find its efficiency as a percentage.

12. An object moves at constant velocity 24 m/s for 34 s. Find displacement in m.

13. A device receives 900 J and delivers 405 J of useful energy. Find its efficiency as a percentage.

14. A device receives 4500 J and delivers 1575 J of useful energy. Find its efficiency as a percentage.

15. An object moves at constant velocity 2 m/s for 7 s. Find displacement in m.

16. An object moves at constant velocity 24 m/s for 8 s. Find displacement in m.

17. An object moves at constant velocity 2 m/s for 33 s. Find displacement in m.

18. A device receives 7100 J and delivers 5680 J of useful energy. Find its efficiency as a percentage.

19. A device receives 200 J and delivers 110 J of useful energy. Find its efficiency as a percentage.

20. An object moves at constant velocity -28 m/s for 27 s. Find displacement in m.