Question

A block weighing 200 N is pushed along a surface. If it takes 80
N (static friction) to get the block moving and 40 N (kinetic
friction) to keep the block moving at a constant velocity, find the
static and kinetic coefficients.

Answer 1

Answer:

A block weighing 200 N is pushed along a surface. If it takes 80 N to get the block moving and

40 N to keep the block moving at a constant velocity, what are the coefficient of friction

(A) 0.2; 0.1

(B) 0.3; 0.2

(C) 0.4; 0.3

(D) 0.4;0.2

Explanation:

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Answer 2

Answer:

static coefficient= 2/5g

Kinetic coefficient= 1/5g

Explanation:

m= 200N

Normal = 200g. (g= acc. due to gravity)

Fs = 80 N

Therefore, 80 = 200g * us

us = 2/5g

Again,

Fk = 40 N

40 = 200g*uk

uk = 1/5g