alleryThe maximum speed at which a car can round an unbanked circular turn of radius 150 m without skidding is (μs = 0.6, g = 10 m s⁻²):
A15 m s⁻¹
B45 m s⁻¹
C90 m s⁻¹
D30 m s⁻¹
Answer & Solution
Correct answer: D. 30 m s⁻¹
On a level road friction provides the centripetal force: v_max = √(μs R g) = √(0.6×150×10) = √900 = 30 m s⁻¹, independent of mass.
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 = 1A 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 block just begins to slide down an incline when the angle of inclination is 30°. The coeA 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.