Grade 8 Motion & energy worksheet

What is on the worksheet

1. Velocity changes from 19 m/s to 19 m/s in 8 s. Find average acceleration in m/s².

2. A perpendicular force of 196 N acts over 14 m². Find the pressure in Pa.

3. Velocity changes from 13 m/s to 49 m/s in 9 s. Find average acceleration in m/s².

4. A device transfers 714 J in 14 s. Find average power in W.

5. An object moves at constant velocity -28 m/s for 11 s. Find displacement in m.

6. A device receives 6300 J and delivers 3465 J of useful energy. Find its efficiency as a percentage.

7. A device transfers 299 J in 23 s. Find average power in W.

8. A device receives 7300 J and delivers 3650 J of useful energy. Find its efficiency as a percentage.

9. A perpendicular force of 168 N acts over 28 m². Find the pressure in Pa.

10. A device transfers 364 J in 7 s. Find average power in W.

11. A perpendicular force of 456 N acts over 8 m². Find the pressure in Pa.

12. Lift a 9 kg mass vertically by 24 m. Using g = 10 m/s², find the increase in gravitational potential energy in J.

13. Lift a 8 kg mass vertically by 7 m. Using g = 10 m/s², find the increase in gravitational potential energy in J.

14. An object of mass 6 kg accelerates at 14 m/s². Find the net force in N.

15. Velocity changes from 0 m/s to 32 m/s in 4 s. Find average acceleration in m/s².

16. Velocity changes from 22 m/s to 12 m/s in 5 s. Find average acceleration in m/s².

17. A device receives 3800 J and delivers 2470 J of useful energy. Find its efficiency as a percentage.

18. Velocity changes from 1 m/s to 73 m/s in 9 s. Find average acceleration in m/s².

19. Velocity changes from 0 m/s to 60 m/s in 12 s. Find average acceleration in m/s².

20. A device transfers 468 J in 6 s. Find average power in W.