Question

A block of mass m is pushed a horizontal dis tance d from position a to position b, along a horizontal plane with friction coefficient |. then the mass is pushed from b to a. if the horizontal force pushing the mass from a to b is p and the force pushing the mass from b to a is _ p what is the total work done by friction? 1. 2(p - (im g) d 2.2（1mg-pd 3. 42 umad

Answer 1

The total work done by friction can be found by calculating the work done when the block moves from position a to position b and when it moves from position b to position a. The work done by friction is equal to 2 times the force of friction multiplied by the distance traveled.

Step-by-step explanation:

The total work done by friction can be found by calculating the work done when the block moves from position a to position b and when it moves from position b to position a. The work done by friction is equal to the force of friction multiplied by the distance traveled. When the block is pushed from a to b, the force pushing the mass is p. The work done by friction can be calculated as W1 = |p| * d. When the block is pushed from b to a, the force pushing the mass is -p. The work done by friction can be calculated as W2 = |-p| * d = |p| * d. Therefore, the total work done by friction is W = W1 + W2 = |p| * d + |p| * d = 2|p| * d. Therefore, the correct option is 1. 2(p - (im g) d).