You have been asked by your local school district to review the plans for purcha

Question

You have been asked by your local school district to review the plans for purchasing a new school bus. A major concern is the safety of the kids. Knowing that kids on a bus rarely wear seatbelts, you decide to conduct a test to determine the coeffiecent of static friction between the bus seats and blue jeans. So you wrap a 2 kg brick in a piece of denim fabic and place it on a seat. After several test stops from a speed of 30mph (44ft/s), you determine that the minimum stopping distance the bus can have without the brick sliding is 50 ft.

Explanation / Answer

here

acceletation a = v^2/2s

a = 44* 44/(2* 50)

a = 19.36 ft/s^2

but a = ut

so coefficient of static fricttion = u = a/g

u = 19.36/32

u = 0.605 is the coefficient of static friction

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