A man pulls a box up a incline to rest at a height of . He exerts a total of of work. What is the coefficient of friction on the incline?

Mass 1 weighs and mass 2 weighs .

What would be the minimum coefficient of static friction between mass 1 and the surface that would cause mass 1 to not slide in this system?

A block is held at rest at the top of slope inclined at . When the block is let go it slides down the slope, experiencing friction along the way. If the acceleration of the block down the ramp is , what is the coefficient of kinetic friction between the block and ramp?

2 masses are connected by a pulley as demonstrated by the image above. The weight of mass 1 is and and the weight of mass 2 is . The coefficient of static friction between mass 1 and the block it rests on is and the coefficient of kinetic friction between the 2 surfaces is . The system is not drawn to scale.

How fast will mass 1 be accelerating in this system?

A young skier has lost control and is now traveling straight down a mountain. The skier is halfway down a run with a slope of and traveling at a rate of . If the skier is traveling at a rate of at the end of the run, what is the coefficient of kinetic friction between the skis and snow?

A baseball player is running with a velocity of and slides to make it to the home plate. Calculate the coefficient of kinetic friction, between the player's clothes and the clay.

Consider the following scenario:

A sledder of mass is at the stop of a sledding hill at height with a slope of angle .

The hill has a height of and a slope . If a 75-kilogram sledder is initially at rest at the top of the hill and reaches the bottom of the hill with a final velocity , what is the average frictional force applied to the sledder? Neglect air resistance and any other frictional forces.

Consider the following scenario:

A sledder of mass is at the stop of a sledding hill at height with a slope of angle .

The sledder has a mass and . If the gravitational force in the direction of the sledders movement is , what is the force of kinetic friction? Neglect air resistance or any other frictional forces.

A heavy truck and a relatively light car with tires made of identical material are driving next to each other at . They both slam on the brakes at the exact same time. Which will stop first? Assume they each locked up the brakes and all friction was thus kinetic friction.

A box with mass 20kg is on a cement floor. The coefficient of static friction between the box and floor is 0.25. A man is pushing the box with a horizontal force of 35N. What is the magnitude of the force of static friction between the box and floor?