1)The system shown is on verge of starting moving up the incline. Each block wei

Question

1)The system shown is on verge of starting moving up the incline. Each block weighs 20 N and an incline angle is 280. The coefficient of static friction between the block M and the incline is closest to:

2)

Traveling at a speed of 21 m/s, the driver of a car suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.72. How much time does it take for the car to come to stop?

The system shown is on verge of starting moving up the incline. Each block weighs 20 N and an incline angle is 280. The coefficient of static friction between the block M and the incline is closest to: Traveling at a speed of 21 m/s, the driver of a car suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.72. How much time does it take for the car to come to stop?

Explanation / Answer

1)

as they are almost rest and block is trying to go upward friction will be downward.

so by FBD

20=20sin(28) +20cos(28)*u

u=0.6

2)deceleration due to friction =umg/m=ug

V=u+at

t=-u/-ug

=21/(0.72*9.8)

=2.97s

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