Problem 4.37 A force of 38.0 N is required to start a 3.0-kg box moving across a

Question

Problem 4.37

A force of 38.0 N is required to start a 3.0-kg box moving across a horizontal concrete floor.

Part A

What is the coefficient of static friction between the box and the floor?

Express your answer using two significant figures.

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Part B

If the 38.0-N force continues, the box accelerates at 0.30 m/s2 . What is the coefficient of kinetic friction?

Express your answer using two significant figures.

Problem 4.37

A force of 38.0 N is required to start a 3.0-kg box moving across a horizontal concrete floor.

Part A

What is the coefficient of static friction between the box and the floor?

Express your answer using two significant figures.

SubmitHintsMy AnswersGive UpReview Part

Part B

If the 38.0-N force continues, the box accelerates at 0.30 m/s2 . What is the coefficient of kinetic friction?

Express your answer using two significant figures.

s =

Explanation / Answer

minimum force applied = maximum static frictional force

F = u*m*g

38 = us*3*9.8

us = 1.3

part(B)

Fnet = m*a

F - uk*m*g = m*a

38 - (uk*3*9.8) = 3*0.3

uk = 1.26

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