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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 if we run opposite to the wind force exactly to the speed of Wind then are we doing work.
• Hi! There is a correction in your question, you told 'to the speed of wind' in fact it is force of the wind. If we run equal to the force of the wind in the opposite direction, then then the net force would be 0. So, there won't be any work done