What is the difference in work needed to push a 100 kg crate (at constant speed)a distance of 2 m along an inclined plane that is at an angle of 20 degrees with the horizontal,if the coefficient of kinetic friction was equal to 0.20 or zero?
A)670 N
B)1040 N
C)no difference
D)370 N
E)134 N

Question

Quizplus · Accepted Answer

The work done against friction is the difference. With friction, work = friction force * distance = (0.20 * 100 * 9.8 * cos(20)) * 2. Without friction, work is zero. The difference is approximately 370 N.

What Is the Difference in Work Needed to Push a 100