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In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
A vessel containing 50 kg of water is placed at a height 15 m above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? (g = 10 m s-2)
State two disadvantages of producing hydroelectricity.
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
What do you mean by a kilo joule?
Give an example
Chemical energy changes to electrical energy.
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A green plant is carrying out photosynthesis.
