Question

Find the coefficient of kinetic friction if a box weighing 80 N is pushed across the floor with an applied force of 30 N. A) 0.25 B) 0.375 C) 0.5 D) 0.625

Answer 1

In this case, the applied force of 30 N is equal to the frictional force. The coefficient of kinetic friction is 0.375.

Therefore, the correct answer is B

Step-by-step explanation:

The coefficient of kinetic friction can be found using the formula:

Frictional Force = Coefficient of Kinetic Friction × Normal Force

In this case, the applied force of 30 N is equal to the frictional force:

30 N = Coefficient of Kinetic Friction × Normal Force

The normal force is equal to the weight of the box, which is 80 N:

30 N = Coefficient of Kinetic Friction × 80 N

Simplifying the equation, we can find the coefficient of kinetic friction:

Coefficient of Kinetic Friction = 30 N ÷ 80 N = 0.375

Therefore, the correct answer is B) 0.375.