Question

State two example of negative work done

Answer 1

Hi.

Negative work is said to be done when the displace of  the object occurs in the opposite direction of the force applied.

For example,

1. If you throw a ball upwards, the work done by you is positive but, the work done by the gravity on the ball is negative as gravity acts in the downward direction but the chalk is moving upwards. Thus, gravity has done a negative work on the ball.

2. Now, if the ball is lying stationary on the ground and you push it, again, you have done a positive work but this time, friction is doing a negative work against the ball. It is acting in the opposite direction to that of the force applied by you and hence in the opposite direction of the displacement of the ball. Hence, friction has done a negative work on the ball.

Hope it helps.

Answer 2

Answer:

Explanation:

a. . The push of a block on a frictional surface

b. Climbing a tree against the gravitational force

c. Drowning of ship against the water buoyant force

d. Kicking a moving football while in motion

e. The adventure sport of Tug of war while opponents pulling the rope hard.

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