Grade 12 Physics practice

What is on the worksheet

1. A sliding block has normal force 285 N and kinetic friction coefficient 0.3. Find the friction-force magnitude in this model. Round to 3 decimal places if needed. Answer in N.

2. A 320 g sample completely melts at its melting temperature. Its latent heat is 310000 J/kg. Ignore losses. Find energy required. Round to 3 decimal places if needed. Answer in J.

3. A constant 67 N force acts through a 20 m displacement. The cosine of the angle between them is -1. Find the work by this force. Round to 3 decimal places if needed. Answer in J.

4. Two perpendicular forces of 105 N and 252 N act on a point. Find the magnitude of their resultant. Round to 3 decimal places if needed. Answer in N.

5. A 44 cm straight wire carries 8 A perpendicular to a uniform field of 1.3 T. Find magnetic force magnitude. Round to 3 decimal places if needed. Answer in N.

6. A 80-turn coil has flux change 38 mWb per turn over 210 ms. Find average induced emf magnitude. Round to 3 decimal places if needed. Answer in V.

7. An ideal AC transformer has primary 200 turns, secondary 1900 turns and primary voltage 51 V. Find secondary voltage. Paper model only. Round to 3 decimal places if needed. Answer in V.

8. Carts 3 kg at 3 m/s and 6 kg at -5 m/s collide and stick. Velocities share one signed axis; external impulse is zero. Find their final velocity. Round to 3 decimal places if needed. Answer in m/s.

9. Carts 5 kg at 4 m/s and 10 kg at -8 m/s collide and stick. Velocities share one signed axis; external impulse is zero. Find their final velocity. Round to 3 decimal places if needed. Answer in m/s.

10. A model sample begins with 448000 undecayed nuclei. Half-life is 18 h. Find the expected number still undecayed after 72 h. Round to 3 decimal places if needed.

11. A 440-turn coil has flux change 28 mWb per turn over 130 ms. Find average induced emf magnitude. Round to 3 decimal places if needed. Answer in V.

12. A 1.4 kg sample with specific heat 500 J/(kg·°C) warms by 47 °C. No phase change or heat loss occurs. Find energy supplied. Round to 3 decimal places if needed. Answer in J.

13. An object displaces 23 litres of fluid of density 600 kg/m³. Use g = 10 N/kg and 1 litre = 0.001 m³. Find buoyant force. Round to 3 decimal places if needed. Answer in N.

14. An object falls from rest for 6 s in an ideal model with g = 2 m/s² and no air resistance. Find the downward distance. Round to 3 decimal places if needed. Answer in m.

15. A thin converging lens has focal length +23 cm. A real object is 95 cm from it, beyond the focal point. Using 1/f = 1/do + 1/di, find real image distance. Round to 3 decimal places if needed. Answer in cm.

16. Two perpendicular forces of 195 N and 468 N act on a point. Find the magnitude of their resultant. Round to 3 decimal places if needed. Answer in N.

17. A 13 kg object changes speed from 5 m/s to 16 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.

18. A 3 kg sample with specific heat 4200 J/(kg·°C) warms by 5 °C. No phase change or heat loss occurs. Find energy supplied. Round to 3 decimal places if needed. Answer in J.

19. In one dimension, u = 8 m/s and constant a = -4 m/s². Find the signed velocity after 13 s. Round to 3 decimal places if needed. Answer in m/s.

20. An optical image has magnification magnitude 1. The object height is 27 mm. Find image height magnitude. Round to 3 decimal places if needed. Answer in mm.