Question

A horizontal force of 10.0 N is acting on a 10 kg box that is sliding to the right along the floor with velocity v (as depicted in the adjacent figure). The coefficient of kinetic friction between the box and the floor is 0.20. The box is moving with:-

• A. acceleration to the left.
• B. acceleration to the right.
• C. constant speed and constant velocity.
• D. constant speed but not constant velocity.

Answer 1

The correct option is A acceleration to the left.

Here friction force against the box motion is $f=\mu mg=0.20\times 10\times 10=20N$
As the friction force is greater than the 10 N force, the box will accelerate to left. The velocity or speed will decrease due to the friction.