Grade 9 Physics practice

What is on the worksheet

1. Signed velocity changes from 25 m/s to 28 m/s in 2 s. Find the average acceleration. Round to 3 decimal places if needed. Answer in m/s².

2. A model cart starts at 27 m/s and slows uniformly at 9 m/s² until rest. Ignore reaction time. Find the stopping time. Round to 3 decimal places if needed. Answer in s.

3. A robot moves 133 m east and then 7 m west along a straight line. Find the total distance travelled. Round to 3 decimal places if needed. Answer in m.

4. An ohmic resistor of 74 Ω has potential difference 46 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.

5. A device receives 1230 J and has useful-energy efficiency 50%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.

6. Two carts approach each other on a straight track at 26 m/s and 3 m/s. How fast is their separation decreasing? Round to 3 decimal places if needed. Answer in m/s.

7. An ohmic resistor of 55 Ω has potential difference 20 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.

8. A wave has frequency 13 Hz and wavelength 2.1 m. Find its speed. Round to 3 decimal places if needed. Answer in m/s.

9. Two carts approach each other on a straight track at 9 m/s and 4 m/s. How fast is their separation decreasing? Round to 3 decimal places if needed. Answer in m/s.

10. A 23 kg load is raised vertically by 10 m in a field g = 10 N/kg. Find its gravitational potential-energy gain. Round to 3 decimal places if needed. Answer in J.

11. Two carts approach each other on a straight track at 18 m/s and 6 m/s. How fast is their separation decreasing? Round to 3 decimal places if needed. Answer in m/s.

12. A 13 kg object changes signed velocity from 10 m/s to -12 m/s. Find the net impulse on it. Round to 3 decimal places if needed. Answer in N·s.

13. A 2.7 kg sample with specific heat 2100 J/(kg·°C) warms by 38 °C. No phase change or heat loss occurs. Find energy supplied. Round to 3 decimal places if needed. Answer in J.

14. A 10 kg load is raised vertically by 15 m in a field g = 10 N/kg. Find its gravitational potential-energy gain. Round to 3 decimal places if needed. Answer in J.

15. A robot moves 37 m east and then 25 m west along a straight line. Find the total distance travelled. Round to 3 decimal places if needed. Answer in m.

16. A rover travels 355 m in 70 s, then 111 m in 22 s. Find its average speed for both stages. Round to 3 decimal places if needed. Answer in m/s.

17. In one dimension, u = 17 m/s and constant a = 6 m/s². Find the signed velocity after 8 s. Round to 3 decimal places if needed. Answer in m/s.

18. A model cart starts at 27 m/s and slows uniformly at 10 m/s² until rest. Ignore reaction time. Find the stopping time. Round to 3 decimal places if needed. Answer in s.

19. A 5 kg object changes signed velocity from -15 m/s to -9 m/s. Find the net impulse on it. Round to 3 decimal places if needed. Answer in N·s.

20. A 2.8 kg sample with specific heat 2100 J/(kg·°C) warms by 50 °C. No phase change or heat loss occurs. Find energy supplied. Round to 3 decimal places if needed. Answer in J.