Q7 of 33 Page 158

What are the various energy transformations that occur when you are riding a bicycle?

The chemical energy of the food changes into heat and then to muscular energy. On paddling, the muscular energy changes into mechanical energy.


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5

An object of mass 10 kg is at a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer.

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The potential energy of a freely falling object decrease progressively. Does this violate the law of conservation of energy? Why?

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Does the transfer of energy take place when you push a huge rock with all you might and fail to move it? Where is the energy you spend going?

 9

A certain household has consumed 250 units of energy during a month. How much energy is this in joules?