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N6_presentation

# N6_presentation - The static and kinetic friction forces on...

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N K KF N s SF F F F F μ μ = The static and kinetic friction forces on an object are proportional to the normal force acting on the object Generally, S K μ μ <

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A block rests on a rough floor. A horizontal force of 5 N is required to get the block moving. Once moving, the force required to keep the block moving at constant velocity will generally be (A) zero (B) 5 N (C) less than 5 N, but not zero (D) more than 5 N
(N6T.2) A certain crate sits on a rough floor. You find that you have to apply a horizontal force of 200 N to get the crate moving. If you put some massive objects in the crate so that its mass is doubled, how much force does it take to get the crate moving now? (A) Still 200 N (B) 400 N (C) 800 N (D) It depends. Specify: __________

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(N6B.2) Imagine that the coefficient of static friction μ s between a 25-kg box and the floor is 0.55. How hard would you have to push horizontally on the box to get it moving? F SF F g F N F N 245 ) m/s kg)(9.8 25 ( 2 = = = = mg F F F N g N ( 29 N 135 N) 245 )( 55 . 0 ( max = = = N s SF F F μ N 135 min = F Therefore,
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