CHAPTER FIVE PHYSICS 195 NOTES (part two)

# CHAPTER FIVE PHYSICS 195 NOTES (part two) - Physics 195...

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Click to edit Master subtitle style 1/5/11 CHAPTER FIVE NOTES Physics 195 Lecture (part two)

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1/5/11 Frictional Force Friction Opposes motion between systems in contact Parallel to the contact surface Depends on the force holding the surfaces together Normal force (N) Static Friction
1/5/11 Kinetic Friction What does it do? It is in opposition to relative motion! How do we characterize this in terms we have learned? Friction results in a force in the direction opposite to the direction of relative motion!

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1/5/11 CRATE You are pushing a wooden crate across the floor at constant speed. You decide to turn the crate on end, reducing by half the surface area in contact with the floor. In the new orientation, to push the same crate across the same floor with the same speed, the force that you apply must be about a) four times as great
1/5/11 BOX Two boxes A & B made of the same surface areas A A = A B and material but with different masses, m A < m B are placed on the floor. The force needed to set box A in motion compared to that on box B is: A. larger B. the same C. smaller

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EXAMPLE 1 Find acceleration of block. Y: Normal force is balanced by gravity because there is no vertical motion. Example: N = W= Mg
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## This note was uploaded on 01/04/2011 for the course PHYS 195 taught by Professor Anderson during the Fall '07 term at San Diego State.

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CHAPTER FIVE PHYSICS 195 NOTES (part two) - Physics 195...

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