the static coefficient of friction between these same surfaces is 0.21, how hard

Question

the static coefficient of friction between these same surfaces is 0.21, how hard do you have to push horizontally to get the refrigerator to start moving? Stopping at a Red Light You are driving a 2500.0 - kg car at a constant speed of 14.0 m/s along a wet, but straight, level road. As you approach an intersection, the traffic light turns red. You slam on the brakes. The car's wheels lock, the tires begin skidding, and the car slides to a halt in a distance of 25.0 m. What is the coefficient of kinetic friction between your tires and the wet road? Force and Motion in Two Dimensions An object in equilibrium has three forces exerted on it. A 33.0 - N force acts at 90.0degree from the x axis and a

Explanation / Answer

prob 94.
Mcar = 2500 kg
Vinitial = 14 m/sec
distance it took to stop,s = 25 m
coefficient of kinetic friction, = ?

Kinetic frctn force = N

= * m * g

= * 2500 * 9.8 N = 24500 * N

deceleration of car = force/mass

= 24500 * / 2500

= * 9.8 m/sec2

now , v^2 = u^2 + 2 *a*s

0 = 14^2 - 2 * *9.8 * 25

= 0.4

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