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AP Physics 1: Friction Coefficient WS
1. A force of 490 N pulls a 30 kg block horizontally across the floor, 𝜇𝑘 = 0.1.
a) What is the kinetic friction force? (Answer: 29.4 N)
b) What is the net force acting on the box? (Answer: 460.6 N)
b) find the acceleration of the block. (Answer: 15.4 m/s2)
2. A box with a weight of 686 N is slid along the floor by a horizontal 400-N force. The value of
𝜇𝑘 between the box and the floor is 0.50.
a) What is the kinetic friction force? (Answer: 343 N)
b) Find the acceleration of the box. (Answer: 0.814 m/s2)
3. A box of mass 𝑚 is slid along the floor by a horizontal force with value 𝐹. The value of the
friction coefficient is 𝜇𝑘 between the box and the floor. Gravity can be used as 𝑔.
a) Calculate the kinetic friction force in terms of values given.
b) Calculate the net force acting on the box in terms of values given.
c) Calculate the acceleration of the box in terms of values given.
3. If the friction force of a box and the floor is 𝑓𝑥 and the friction coefficient is 𝜇𝑘 ,
a) Calculate the mass of the box in terms of values given. (let gravity be given by 𝑔)
b) If someone pushes the box with a force of 𝐹𝑥 horizontally. Calculate the net force acting on the
box in terms of values given.