Homework 4Sol

# Visualize the block ends where it starts so x2 x0 0 m

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

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 x-direction, 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...
View Full Document

## This note was uploaded on 05/20/2008 for the course PHYS 161 taught by Professor Hammer during the Spring '07 term at Maryland.

Ask a homework question - tutors are online