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Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
Why is a jack screw provided with a long arm?
A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.
(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
What do you mean by degradation of energy?
A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :
Why does a spanner have a long handle?
Name the force acting away from the centre of circular path.
When you move upstairs, do you perform some work?
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.
