Question Detail

PHY 101 Friction Objective Question
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Question

When a body is at rest on a surface and an external force F is applied, what is the behavior of the static frictional force f_s?
Options
A It acts in the same direction as F.
B It has a constant value of μ_s F_N.
C It acts directly opposite to F and they are equal.
Correct Answer
D It is always zero until the body moves.
Correct Answer

Option C is the correct answer.

Detailed Explanation

The lecture states that if the body does not move, the static frictional force f_s acts directly opposite to the applied force F, and both forces are equal to each other, canceling out.

Hint

Think about Newton's first law: if the body is not accelerating, the net force on it must be zero.

Question Info

Course: PHY 101
Topic: Friction
Type: Objective
Difficulty: Not specified
Question 499 of 1250
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