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The following are friction problems. Use the equations in your book/notes to solve them.

1) A desk has a mass of kilograms. If the coefficient of static friction between the desk and the floor is , what force must be used to move the desk from rest?
N

2) Once the desk above is in motion, what force must be used to keep it moving at a constant velocity if the coefficient of kinetic friction is ?
N

3) An object takes 12.3 meters to stop because of friction. Assume no skidding. If the coefficient of static friction is , what is the initial velocity of the object?
m/s

4) A block begins to slide down a ramp after being elevated to an angle of degrees. What is the coefficient of static friction?
(no units)

This internet problem javascript and source code was adapted from that of Neil Schmidgall of Glenbrook South High School.