Question

Find the direction of friction on the block for the figure shown.

• A. $\text{Perpendicular to the plane}$
• B. $\text{Up the plane}$
• C. $\text{Down the plane}$
• D. $\text{None of these}$

Answer 1

The correct option is B $\text{Up the plane}$

The relative velocity of the block will be down the plane, as plane is static and only block is moving down the plane. So, friction force will be up the plane as it opposes the relative motion.