A box is released on a 25 degree incline and accelerates down the ramp at . What is the coefficient of kinetic friction impeding its motion?

A child slides down a slide with a 30 degree incline, and at the bottom her speed is precisely half what it would have been if the slide had been frictionless. Calculate the coefficient of kinetic friction between the slide and the child.

A crate slides across a floor for before coming to rest from its original position. What is the coefficient of kinetic friction on the crate? Assume

A horizontal force accelerates a box from rest across a horizontal surface where friction is present at a constant rate. Then the experiment is repeated. All conditions remain the same with the exception that the horizontal force is doubled. What happens to the box’s acceleration.

A block is on a smooth horizontal surface (), connected by a tine cord that passes over a pulley to a second block which hangs vertically (). Find the formula for the acceleration of the system. Ignore friction and the masses of the pulley and cord.

Three blocks on a frictionless horizontal surface as in contact with each other. A force is applied to the first block (). Determine the net force on block B terms of , , and and .

Susan is trying to push a crate across the floor. She observes that the force of friction between the crate and the floor is . What is the coefficient of static friction? Assume

Which of the following cannot be true of an object on a given surface?

Two toy cars (15kg and 3kg) are released simultaneously on an inclined plane that makes an angle of 28 degrees with the horizontal. Which statement best describes their acceleration once they are released. Assume that the track is frictionless.