SAT Subject Physics Practice Question 565: Answer and Explanation
6. The normal force between two surfaces is increased by four times. The coefficient of static friction will
A. be cut in half.
B. be doubled.
C. remain the same.
D. be quadrupled.
E. be undetermined.
Correct Answer: C
The correct answer is (C). The frictional force between two surfaces will increase when the normal force increases, but the coefficient of friction between two surfaces is constant.