Question Detail
Question
A block is at rest on a horizontal surface. A small horizontal force is applied, but the block does not move. What is the relationship between the applied force F and the static friction force f_s?
Correct Answer
Option D is the correct answer.
Detailed Explanation
The lecture states that if the body does not move, the static frictional force acts directly opposite to the force F, and both forces are equal to each other and cancel out.
Hint
Since the block is not accelerating, the net force on it in the horizontal direction must be zero.