Josephine sits on a horizontal carpeted board while wearing a suit made of sandpaper. The board is gradually inclined until Josephine begins to slide. At this point, the angle of inclination is measured, and found to be 60 degrees.

What is the coefficient of static friction between the sandpaper and the carpet?

A skater on a skating rink is traveling at 8 mph, and takes 30 seconds to come to a stop due to the friction between the rink and her skates. What is the coefficient of friction between her skates and the ice?

An object is being pushed on a horizontal surface. The person doing the pushing starts pushing with a slight force, and gradually increases the force until the object begins to move. At this point, the person continues pushing with the same force for 5 seconds, and in that time, the object moves 5 feet.

If the coefficient of static friction is the coefficient of kinetic friction, what is µ_s, the coefficient of static friction?

A block of mass 1.95 kg slides with an initial speed of 4.33 m/s on a smooth, horizontal surface. The block now encounters a rough patch with a coefficient of kinetic friction given by µ_k = 0.260. What is the acceleration of the block when it is in the rough patch?

Mildred, who has a mass of 75kg, puts on a pair of ice skates, and stands at one end of an ice rink. The coefficient of kinetic friction between her skates and the ice is the coefficient of static friction. She holds one end of a rope, and her friend Gertrude gently pulls the other end of the rope until she starts moving. A force of 49 N is required to start her moving.

Gertrude continues to pull with this same force, until Mildred crashes into the wall at the other end of the rink, at a speed of 10 .

How long is the skating rink?