Quiz2_Sol

# Quiz2_Sol - 1 Duration: 10 mins NAME: PHY 121 - Quiz 2...

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1 Duration: 10 mins NAME: PHY 121 - Quiz 2 (Solution) Q1: The learning Goal is to understand kinetic and static friction. A block of mass lies on a horizontal table. The coeFcient of static friction between the block and the table is μ s . The coeFcient of kinetic friction is μ k , with μ k < μ s (3 points). A. If the block is at rest (and the only forces acting on the block are the force due to gravity and the normal force from the table), what is the magnitude of the force due to friction? ± F friction = 0 Reasoning: There are no frictional forces acting on it, neither static or kinetic B. Suppose you want to move the block, but you want to push it with the least force possible to get it moving. With what force F must you be pushing the block just before the block begins to move? Express the magnitude of F in terms of some or all the variables μ s , μ k , and m , as well as the acceleration due to gravity g . ± F

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## This note was uploaded on 11/17/2010 for the course PHY 7A 56192 taught by Professor ? during the Spring '09 term at UC Davis.

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Quiz2_Sol - 1 Duration: 10 mins NAME: PHY 121 - Quiz 2...

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