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An object falling freely from the roof of a multistorey building has ________ and _________ energy when halfway down the building.
Give one example to show the conversion of potential energy to kinetic energy when put in use.
A boy of mass m climbs up a staircase of vertical height h.
(a) What is the work done by the boy against the force of gravity?
(b) What would have been the work done if he uses a lift in climbing the same vertical height?
Name the type of energy (kinetic energy K or potential energy U) possessed in the following case:
A piece of stone placed on the roof.
What is meant by the renewable and non-renewable sources of energy? Distinguish between them giving two examples of weach.
Select the renewable and non-renewable sources of energy from the following:
Diesel
State two advantages and two disadvantages of using hydro-energy for producing electricity.
Give one example when:
Heat energy changes to kinetic energy.
Can you tell?
Describe one natural chain of transformation of energy.
Name the type of energy (kinetic energy K or potential energy U) possessed in the following case:
A moving cricket ball
