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Grade: Upto college level

                        

In order to stop a car in shortest distance on a horizontal road,one should (a)apply brakes very hard so 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

11 years ago

Answers : (1)

Ramesh V
70 Points
							

d) is trivially wrong
c) is wrong, since there are times of possible maximum braking force and times of zero braking force

To obtain maximal braking, you want to maintain static friction between the tyre and road since kinetic friction has a lower co-efficient.

a) will let the friction enter kinetic friction and the braking force on the wheels will reduce once skidding

b) will maintain the optimal force betwen tyre and road whilst staying within the static friction threshold

(b is very difficult to perform successfully; it is the correct answer for a physics question but c is the safest and recommended option when driving without ABS. With ABS, just hit the brake pedal hard!)

ABS:anti-lock breaking system

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Regards

Ramesh

11 years ago
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