3) Give an order of magnitude estimate (explaining your reasoning) for the magnitude of the friction...
3) Give an order of magnitude estimate (explaining your reasoning) for the magnitude of the friction force that stops your car when you slam the brakes, based on how long it takes for the car to stop from its initial speed.
Homework Answers
Lets take initial speed of car as 25 m/s, mass of car can be assumed to be 1000kg.
Usual. time taken to stop the car is 4s.
Friction force = ma because it is only horizontal force assumed to be acting.
= m*(v/t)
= 1000*25/4
= 6250 N
so friction force for a car to stop is usually of the order 6*10^3 N
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