alleryA block just begins to slide down an incline when the angle of inclination is 30°. The coefficient of static friction between block and incline is:
A0.87
B0.50
C0.58
D1.73
Answer & Solution
Correct answer: C. 0.58
At the verge of sliding the angle equals the angle of repose: tan θ = μs, so μs = tan 30° = 0.577 ≈ 0.58.
Keep practising Unit 2B: Friction, Gravitational and Normal Forces
Browse all Unit 2B: Friction, Gravitational and Normal Forces questions for AP Intermediate 1st Year, or explore more Physics topics.
Related questions
A net force F = 6t newton (t in seconds) acts on a 2 kg body initially at rest. The speed For a 3 kg block connected over a frictionless pulley to a 20 kg trolley (μk = 0.04, g = 1The maximum speed at which a car can round an unbanked circular turn of radius 150 m withoA 0.5 kg stone tied to a string is whirled in a horizontal circle of radius 2 m at a speedA 50 kg person stands on a weighing scale inside a lift accelerating upward at 2 m s⁻² (g A 0.02 kg bullet is fired with a speed of 300 m s⁻¹ from a 4 kg gun. The recoil speed of tA 0.04 kg bullet moving at 90 m s⁻¹ is stopped after penetrating 0.6 m into a block. The aA 0.15 kg ball moving at 12 m s⁻¹ is hit straight back along its path with the same speed.