2. A 5.2-kg box slides a distance of 16.0-m. If the coefficient of kinetic friction is 0.30, what is the work done by the friction force?

6. Two blocks are connected by a very light string passing over a massless, frictionless pulley (see figure). Traveling at a constant speed, the 20.0-N block moves 65.0 cm to the right and the 12.0-N block moves 65.0 cm down. How much work is done a. on the 12.0-N block by gravity? b. on the 12.0-N block by the tension in the string? in total on the 12.0-N block? C. d. on the 20.0-N block by gravity? on the 20.0-N block by the tension in the string? on the 20.0-N block by the normal force? on the 20.0-N block by friction? in total on the 20.0-N block? e. f. g. h. 20.0 N 12.0 N

A child pulls a wagon 5.0 m using a force of 25 N at an angle 15 degrees above horizontal. The force of friction on the wagon is 8.1 N. Calculate the work done on the wagon in the horizontal direction.   a. 6.5 J b. 24.1 J c. 32.5 J d. 80 J e. 84.5 J f. 125.1 J g. 125 J h. don't be silly, you can't calculate the net work without the change in KE!!

On a horizontal surface with µk = 0.70, a 5kg object is dragged with 350N force directed due East. a. Draw all forces, and calculate the work done by each force if the object moves from 3 m to 10 m on the x-axis. Calculate the total work.

4. It takes 3 s for 25 g car to go down a 10 degree incline for 1 m. ? How much work was done by friction? What was the coefficient of friction?

A 65.0-kg file cabinet of is sliding down a rough ramp for a distance of 5.00 m as shown. The friction force on the box is 75.0 N. During this process, what is the work done on the cabinet by the friction force, in Joule? Use g = 10.0 m/s2. Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.

A 65.0-kg file cabinet of is sliding down a rough ramp for a distance of 5.00 m as shown. The friction force on the box is 75.0 N. The cabinet starts from rest. What is the initial kinetic energy of the cabinet at the top of the ramp, in Joules? Use g = 10.0 m/s2.

A 65.0-kg file cabinet of is sliding down a rough ramp for a distance of 5.00 m as shown. The friction force on the box is 75.0 N. During this process, what is the work done on the cabinet by the normal force, in Joule? Use g = 10.0 m/s2. Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.