Grade 7 Physics practice

What is on the worksheet

1. A 22 kg load is raised vertically by 25 m in a field g = 10 N/kg. Find its gravitational potential-energy gain. Round to 3 decimal places if needed. Answer in J.

2. A model device transfers energy at constant power 260 W for 16 s. Find the transferred energy. Round to 3 decimal places if needed. Answer in J.

3. On an east-positive axis, position changes from 50 m to -39 m in 28 s. Find the signed average velocity. Round to 3 decimal places if needed. Answer in m/s.

4. A robot moves 146 m east and then 55 m west along a straight line. Find the total distance travelled. Round to 3 decimal places if needed. Answer in m.

5. A normal force of 606 N acts uniformly over 0.56 m². Find the pressure. Round to 3 decimal places if needed. Answer in Pa.

6. A normal force of 820 N acts uniformly over 0.33 m². Find the pressure. Round to 3 decimal places if needed. Answer in Pa.

7. A wave has frequency 96 Hz and wavelength 4.9 m. Find its speed. Round to 3 decimal places if needed. Answer in m/s.

8. A rover travels 387 m in 18 s, then 165 m in 29 s. Find its average speed for both stages. Round to 3 decimal places if needed. Answer in m/s.

9. A wave has frequency 115 Hz and wavelength 3.7 m. Find its speed. Round to 3 decimal places if needed. Answer in m/s.

10. A robot moves 99 m east and then 39 m west along a straight line. Find the total distance travelled. Round to 3 decimal places if needed. Answer in m.

11. A 15 kg cart has horizontal forces 147 N right and 36 N left. No other horizontal forces act. Taking right as positive, find its acceleration. Round to 3 decimal places if needed. Answer in m/s².

12. A wave has frequency 89 Hz and wavelength 3.7 m. Find its speed. Round to 3 decimal places if needed. Answer in m/s.

13. A rover travels 200 m in 21 s, then 309 m in 58 s. Find its average speed for both stages. Round to 3 decimal places if needed. Answer in m/s.

14. A robot moves 127 m east and then 87 m west along a straight line. Find the total distance travelled. Round to 3 decimal places if needed. Answer in m.

15. A normal force of 209 N acts uniformly over 0.4 m². Find the pressure. Round to 3 decimal places if needed. Answer in Pa.

16. A robot moves 57 m east and then 22 m west along a straight line. Find the total distance travelled. Round to 3 decimal places if needed. Answer in m.

17. A model device transfers energy at constant power 305 W for 30 s. Find the transferred energy. Round to 3 decimal places if needed. Answer in J.

18. A 8 kg cart has horizontal forces 134 N right and 16 N left. No other horizontal forces act. Taking right as positive, find its acceleration. Round to 3 decimal places if needed. Answer in m/s².

19. A model device transfers energy at constant power 760 W for 13 s. Find the transferred energy. Round to 3 decimal places if needed. Answer in J.

20. A wave has frequency 78 Hz and wavelength 4.9 m. Find its speed. Round to 3 decimal places if needed. Answer in m/s.