Static and Kinetic Friction Problems
Name _______________________________
Date __________
1. A 54 kg student is sleeping on the atrium floor. The coefficient of static friction, s, is 0.41.
What is the minimum force necessary to move the student?
2. A force of 645 N is required to push a stationary 132 kg carton resting on a cement floor.
Calculate the coefficient of static friction, s.
3. A 76 N coffee table rests on a rug. It takes a force of 55.5 N to move it. What is the
coefficient of static friction, s?
4. A 63 kg table is pushed with a force of 41 N. It doesn’t move. What is the force of static
friction?
5. A concrete floor and Dracula’s wooden coffin have a coefficient of kinetic fricion, k = 0.43.
Once it’s moving, what force is necessary to slide the 180 kg coffin along the floor?
Static and Kinetic Friction Problems
6. A floor and a 7.0 kg cardboard box have a coefficient of static friction, s = 0.43 and a
coefficient of kinetic friction, k = 0.36.
a) What is the minimum force necessary to start moving the box?
b) What force is necessary to keep it sliding?
7. A 13 kg carton filled with expensive china is thrown across an icy floor whose coefficient of
kinetic friction, k = 0.05.
a) What is the frictional force?
b) Draw a free-body diagram of the carton.
c) What is its acceleration?
d) There is a wall 8.1 meters away. If it starts with an initial velocity of 3.0 m/s, how far does it
travel before it comes to a stop? Does it hit the wall?