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Lesson 1: Work

# Work done on lifting/falling things - Solved numerical

Let's calculate 2 problems on work done on lifting & falling bodies.  Created by Mahesh Shenoy.

## Want to join the conversation?

• Sir, in the question, it's not specified if the woman is pushing the barbell rod upwards, it could be that the woman is lowering the rod, so the work done should be positive.? In questions like these, how will we determine if the work done is negative or positive?
• The woman is lowering the rod but she has to put the force in the opposite direction b'coz if she will apply force in the same direction, she will loose her balance and the rod will fall down on the floor due to gravitational force.......... She has to put force opposite to gravitational force
Hope this helps....
(1 vote)
• Sir which object will fall faster
1. Heavy Object
2. Light Object
(1 vote)
• Both the objects will fall at the same time or we can say no one will fall faster than the other because the acceleration due to gravity(9.8m/s²) is the same for every object(rather it is heavy or light), gravity will pull every object with the same amount of acceleration (gravity doesn't make any difference).
Hope u understood..