Question
Asked Nov 4, 2019

A 1800 kg car traveling at a speed of 13 m/s skids to a halt on wet concrete where μk = 0.30. 

 

How long are the skid marks? 

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Expert Answer

Step 1

Consider the weight of the car be w, mass of the car be m, the normal reaction of the car be N, the frictional force between the tires of the car and concrete be Ff, the acceleration of the car be a, the initial speed of the car be u, the final speed of the car be v, and the distance covered by the car skids, that is the skid marks of the car, be s.

 

Consider the free body diagram of the car,

a
F-AMN
car
Vw-mg
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Image Transcriptionclose

a F-AMN car Vw-mg

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Step 2

Apply Newton’s second law of motion along vertical direction on the car.

ΣF-ma
N -w m(0)
та
0
N -mg
N mg
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ΣF-ma N -w m(0) та 0 N -mg N mg

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Step 3

Apply Newton’s second law of motion al...

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Kinematics

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