Question

The angle between force of friction and instantaneous velocity of the body moving over a rough surface is

• A. Zero
• B. $\pi /2$
• C. $\pi$
• D. Insufficient data

Answer 1

Answer: (C)

$\pi$

The body is moving with a velocity hence friction force will act in the opposite direction of motion. Hence angle between instantaneous velocity and force of friction will be $\pi$.