EVERYDAY SCIENCE

Detailed explanation-1: -A football is kicked with the help of foot muscles. So, the force applied is mechanical force.

Detailed explanation-2: -Contact forces are ubiquitous and are responsible for most visible interactions between macroscopic collections of matter. Pushing a car or kicking a ball are some of the everyday examples where contact forces are at work.

Detailed explanation-3: -According to Newton’s third law, when a body A exerts a force on another body B, B also exerts an equal and opposite force on A. Hence, while kicking a ball, the footballer’s leg will experience the same magnitude of force by which it kicked on the ball but, in the opposite direction.

Detailed explanation-4: -The two forces on the ball are the gravitational force which is acting downward and the normal force of the ground which is acting upward.

Detailed explanation-5: -So, the unbalanced force is the reason for the football movement, and when we kick the football, the unbalanced force acts on it. Therefore, kicking a football is an example of unbalanced force and option (B) is correct.