Question

Consider a wooden block on a rough horizontal surface. When the block is in motion on the surface, the frictional force acting on it is $2N$. What is the amount of force required to keep the block moving uniformly?

• A. A force equal to $2N$ in the direction of motion.
• B. A force greater than $2N$ in the direction of motion.
• C. A force equal to $2N$ in the opposite direction of the motion.
• D. A force less than $2N$ in the opposite direction of the motion.

Answer 1

The correct option is A A force equal to $2N$ in the direction of motion.

A balanced force must act on a body to keep moving it uniformly.
Frictional force always acts in the opposite direction of motion. Therefore, to form a balanced force on the block, a force equal to $2N$ must work in the direction of motion.