A force of 60 N is required to start a 10kg box moving across a horizontal...

Question

Question

A force of 60 N is required to start a 10kg box moving across a horizontal floor.

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

(b) If the 60 N force continues, the box accelerates at 3m/s^2. What is the coefficient of kinetic friction?

P.S please write the right equations and answers asap!!

Answer 1

Answer #1

limiting friction = 60 N = $\mu_s\,N$

N = mg = 98 N

hence $\mu_s$ = 0.612

(b)

acceleration a = 3 m/s²

$a = \frac{60-\mu_k\,N}{m}$

hence $\mu_k\,N$ = 30 N

$\mu_k$ = 0.306

Answer 2

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