Name: ____KEVIN JASH G LINGATING_____
QUIZ 5
ES 122
INSTRUCTION:
Answer the following. Make your solution and illustration as clear as possible.
AVOID ERASURES.
1. A 100-lb force is pulling a 200-lb block as shown. The coefficient of static friction between
the block and the floor is 𝜇𝑠 = 0.6 and the coefficient of kinetic friction is 𝜇𝑘 = 0.4.
a. What is the friction force between the block and the floor?
b. Will the block move?
2. A 10-lb force is pushing the 40-lb block as shown. The incline angle of the plane is 𝛼 = 40 º.
The coefficient of static friction between the block and the incline is 𝜇𝑠 = 0.75 and the
coefficient of kinetic friction is 𝜇𝑘 = 0.65. Will the block slide on the plane? If it does, will
it slide up or down the plane? What is the friction force between the block and the plane?
3. Two blocks are on an incline plane as shown. Block A has a mass of 20kg and Block B has a
mass of 35kg. The incline angle is 20º.
a. What is the minimum coefficient of friction to prevent the blocks from slipping?
Assume the coefficient of friction between the blocks is four time the coefficient
of friction between the block and the plane.
b. What is the tension in the rope?