A Block of Mass M Sits at Rest on a Rough

question 27

Multiple Choice

A block of mass m sits at rest on a rough inclined ramp that makes an angle θ with the horizontal.What must be true about force of static friction f on the block?

• A)f > mg
• B)f > mg cos θ
• C)f > mg sin θ
• D)f = mg cos θ
• E)f = mg sin θ

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