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Unformatted text preview: op. Visualize: The block ends where it starts, so x2 = x0 = 0 m. We expect v2 to be negative, because the block will be moving in the xdirection, so we'll want to take v2 as the final speed. Because of friction, we expect to find v2 < v0. r Solve: (a) The friction force is opposite to v , so f k points down the slope during the first half of the motion and r r up the slope during the second half. w and n are the only other forces. Newton's second law for the upward motion is
a x = a0 = (F )
net x m =
net w sin q  f k m
y =  mg sin q  f k m = n  mg cos q m a y = 0 m /s 2 = (F )
m = n  w cos q m The friction model is f k = m k n . First s...
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This note was uploaded on 05/20/2008 for the course PHYS 161 taught by Professor Hammer during the Spring '07 term at Maryland.
 Spring '07
 Hammer
 mechanics, Work

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