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Physics - Circular Motion Question with Solution | TestHub

PhysicsCircular MotionDynamicsMedium2 minQB

PhysicsMediumsingle choice

A car driver going at speed v suddenly finds a wide wall at a distance r . Should he apply brakes or turn the car in a circle of radius r to avoid hitting the wall.

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Answer:

Solution:

Braking needs a stopping force $F_{1} = \frac{m v ^{2}}{2 r}$ (work over distance $r$ ), while turning in a circle of radius $r$ needs $F_{2} = \frac{m v ^{2}}{r}$ . Since $F_{1} = \frac{F _{2}}{2}$ , braking needs only half the friction, so he should apply the brakes.

Stream:JEESubject:PhysicsTopic:Circular MotionSubtopic:Dynamics

⏱ 2mℹ️ Source: QB

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