Question

Is work done if you pull a child in a wagon?
a. Yes, the force applied is parallel to the direction of motion.
b. Yes, the force applied is perpendicular to the direction of motion.
c. No, the force applied is parallel to the direction of motion.
d. No, the force applied is perpendicular to the direction of motion.

Answer 1

the answer is A. yes, the force applied is parallel to the direction of motion

Answer 2

Answer:

Option A

Explanation:

The work done on a body is the dot product of the force applied (F) and displacement (s) of the body.

W = F·s

⇒W= F s cosФ

where, Ф is the angle between the applied force and direction of motion.

When a child is pulled in a wagon, the force applied is parallel to the direction of the displacement. Thus, Ф =0°

W = F·s

⇒W= F s cos 0°

Hence, a non zero work is done when a child is pulled in a wagon.

Option A is correct.