Friction

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A $100\,\text{N}$ block rests on a surface with coefficient of static friction $0.4$ . What is the maximum static friction force?

40\,\text{N}

100\,\text{N}

0.4\,\text{N}

250\,\text{N}

A block is on the verge of sliding down an incline at angle θ. The coefficient of static friction equals:

A.tan θ

B.sin θ

C.cos θ

D.1/tan θ

The angle of friction is related to the coefficient of friction μ by:

A.tan φ = μ

B.sin φ = μ

C.φ = μ

D.cos φ = μ

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