WORKSHEET - FRICTION
1. A man pushes large cardboard of mass 75.0 kg box across the floor The
coefficient of kinetic friction is μ k = 0.520
The worker exerts a force of 400.0 N forward.
What is the magnitude of the force of friction?
2. In the above question, calculate the net force moving the box?
3. Why does rolling motion experience friction?
4. An object having a mass of 10 kg is placed on a smooth surface. Static friction
between these two surfaces is given as the 15 N. Find the coefficient of static
friction?
5. The normal force and the static frictional force of an object are 50 N and 80 N
respectively. Find the coefficient of static friction?
6. A fridge weighs 1619 N and the static friction coefficient is 0.50. What is the
least force used to move the fridge?
7. A 10.0 kg box rests on a horizontal floor. The coefficient of static friction is
0.40, and that of kinetic friction is 0.30. Determine the force of friction Ffr, acting
on the box if the horizontal applied force FA is exerted on it of magnitude: (a) 0
N (b) 20 N (c) 38 N (d) 40 N.
8. A 10.0 kg box is pulled along a horizontal surface by a force Fp of 40.0 N
applied at a 30.00 angle above horizontal. Assume a coefficient of kinetic friction
0f 0.30. Calculate the acceleration.
9. Two boxes are connected by a chord running over a pully. The coefficient of
kinetic friction between box A and the table is 0.20. Find the acceleration a of the
system. Ignore the mass of the chord and pully and any friction in the pully.
10. A skier has begun descending the 300 slope. If the coefficient of kinetic
friction is 0.10, what is her acceleration?