Question

A block of mass 10kg is pushed by a force F on a horizontal rough plane is moving with acceleration 5 ms-2 When force is doubled, its acceleration becomes 18ms-2. Find the coefficient of friction between the block and rough horizontal plane. (g = 10m/s2).​

Answer 1

Answer:

We know:

ma=F−μmg

Case 1:

5×10=F−100μ

Case 2:

18×10=2F−100μ

Solving simultaneously we get:

F=130N, μ=0.8

Answer 2

Answer:

We know:

ma=F−μmg

Case 1:

5×10=F−100μ

Case 2:

18×10=2F−100

EXPLANATION

Solving simultaneously we get:

F=130N, μ=0.8

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