Laws of Motion – Friction (Static, Kinetic, Rolling)

Grade 11 Physics — Laws of Motion – Friction (Static, Kinetic, Rolling): 25 practice questions with instant scoring and explanations.

1. Friction opposes:
2. Coefficient of static friction μ_s compared to kinetic μ_k is generally:
3. Maximum static friction equals:
4. Kinetic friction equals:
5. A block of mass 5 kg rests on a surface with μ_s=0.4. Minimum force to just move it (g=10):
6. Rolling friction is generally:
7. Angle of friction θ and coefficient of friction μ satisfy:
8. Angle of repose α of a rough incline where μ is the coefficient of friction satisfies:
9. On a rough incline with angle θ greater than angle of repose, the block:
10. A 2 kg block on a horizontal surface with μ_k=0.2 is given push with 6 N (g=10). Acceleration:
11. Friction force when a 2 kg block is pushed with 3 N on a surface with μ_s=0.5 (g=10):
12. If applied force on a stationary block is less than μ_s·N, friction is:
13. Friction depends on:
14. When skidding brakes are used, friction is primarily:
15. Advantages of friction include:
16. To reduce friction, we can use:
17. A body of mass 10 kg is pulled on a rough horizontal surface (μ=0.1) with force 30 N (g=10). Acceleration:
18. Coefficient of rolling friction is typically:
19. A block just slides on incline when tanθ equals:
20. A box slides down a 37° incline with μ_k=0.5 (g=10). Acceleration (sin37=0.6, cos37=0.8):
21. A car of mass 1000 kg moving at 10 m/s stops in 5 s on friction alone. Friction force:
22. In the above, μ_k is (g=10):
23. Limiting friction is:
24. The friction on a freely rolling wheel is:
25. A 5 kg block is pushed horizontally on a rough surface with μ_s=0.3, μ_k=0.2 (g=10). A force of 12 N: