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प्रश्न
उत्तर
The energy of a body is its capacity to do work.
The SI unit of work is 'joules' and the CGS unit is 'erg'.
APPEARS IN
संबंधित प्रश्न
Fill in the blank with suitable word :
1 joule is the work done when a force of 1 __________ moves an object through a distance of one __________ in the direction of __________.
Define the term 'work'. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.
A person of mass 50 kg climbs a tower of height 72 metres. Calculate the work done. (g = 9.8 m s−2).
A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.
Why is the work done on an object moving with uniform circular motion zero?
A boy does work when he pushes against a brick wall. (yes/no).
Is work done a scalar or a vector physical quantity?
List any six forms of energy and write a short note on each of them.
State the energy changes which take place when A piece of magnesium wire is burnt in a jar of oxygen.
Give an example
Electrical energy changes of sound energy.
Define Translational motion.
Explain, why submarines are able to dive underwater as well as a sail on the surface of the water?
A is a push or a pull ______.
A ______ should act on an object.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
An engine is pulling a train.
A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is ______.
