Work Done by a Force (Exercise 1)
Answer the following. Show your complete working. Draw the free body diagram for each case.
1. Determine the work done to roll a metal safe, mass 116 kilograms, a distance of 15.0 meters across a
level floor? The coefficient (µ) of friction is .050.
2. A sled is pulled over level snow a distance of 0.5 kilometers by a force of 124 newtons applied to a rope
that makes an angle of 35 degrees with the snow. Determine the work done.
3. A 75-kilogram crate is to be pushed up an inclined plane 3.00 meters long that makes and angle of 20
degrees with the horizontal. If the coefficient of friction (µ) between the crate and the inclined plane is
0.150, determine the work done.
4. A 30-kilogram box is dragged up an incline that is 12.0 meters long and makes an angle of 32 degrees with
the horizontal. If the coefficient of friction between the box and the incline is 0.15, calculate the amount of
work done by the applied force.
5. The raised end of an inclined plane 4.0 meters long is 0.90 meters high. Neglecting friction, what force is
required to push a steel box weighing 750 Newton's up this plane?
6. A 5.0-kg mass is pushed along a straight line by a net force described in the graph below. The object is at
rest at t = 0 and x = 0
a. What acceleration did the object experience when x = 10 meters?
b. How much work done on the object during the first 20 meters?
c. How much work done to move the object from 20 meters to 30 meters?
d. What is the total work done to the object?