# 8. A driver sees an accident ahead and applies the brakes so the 1000 kg car comes to a stop. a. Sketch a force diagram in the space at right showing all forces acting on the car. (2 points

8.  A driver sees an accident ahead and applies the brakes so the 1000 kg car comes to a stop.

a. Sketch a force diagram in the space at right showing all forces acting on the car. (2 points)

b. Calculate the Force of the Earth on the car and use it to determine the normal Force of the Road on the car. Hint: The Force of the Road balances the Force of the Earth. (2 points)

c. The friction coefficient (µ) between the tires and the road is 0.60. Use it and the normal Force of the Road to calculate the Friction Force. (2 points)

d. Use the Friction Force in Newton’s 2nd Law to calculate the acceleration of the car.

(2 points)

e. The car stops (v=0) in a distance of 50 m. Use the acceleration you found in part d and Kinematics to calculate the initial velocity of the car. (2 points)

Δx =

v =

t =

vi =

a= 