Chapter 4, Problem 1RAT

A soccer ball is kicked to a $30\text{-m/s}$ speed. While being kicked, the amount of force that the player's foot exerts on the ball is

(a) less than the amount of force on the foot.

(b) the same as the amount of force on the foot.

(c) more than the amount of force on the foot.

(d) None of these.

To determine

The correct option for the statement "When walking, your foot pushes backward on the floor and".

Answer to Problem 1RAT

The correct option for the statement "When walking, your foot pushes backward on the floor and" is option (a).

Explanation of Solution

According to Newton's third law, "Every action has an equal magnitude and opposite direction reaction force." For example, a man standing on the ground, then the action force exerted by the man on the ground, is equal to its weight. Similarly, a reaction force of equal magnitude is exerted by ground to the man is termed as a normal force.

This condition is also applicable during walking because when you put your foot on the ground, you are applying action force on the ground in the backward direction. The ground applies an equal force on your foot in the forward direction, which helps you to walk in the forward.

Conclusion:

Therefore, the correct option for the statement "When walking, your foot pushes backward on the floor and" is option (a).