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Retardation

Why and How d...

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Why and How do the wheels of a vehicle slows and stop when the brake shoe is pressed?

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A vehicle slows down on applying brakes. This happens because of

Q. A four -wheel vehicle of mass 1000 kg moves uniformly in a straight line with the wheels revolving at 10 rad/s. The wheels are identical, each with a radius of 0.2 m. Then a constant braking torque is applied to all the wheels and the vehicle experiences a uniform deceleration. For the vehicle to stop in 10 s, the braking torque (in Nm) on each wheel is

Q. In order to stop a car in shortest distance on a horizontal road, one should
(a) apply the brakes very hard so that the wheels stop rotating
(b apply the brakes hard enough to just prevent slipping
(c) pump the brakes (press and release)
(d) shut the engine off and not apply brakes.

Q. Brakes on cars will work best if the friction between the brake shoes and wheels is reduced. True or false?

When a fast-moving vehicle is suddenly stopped by applying brakes, the force that causes deceleration is exerted by the brake.

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