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WorkWork is said to be done whenever the application of the force produces a change.
A change can be the change invelocity
position
shape
temperature
An object can have both potential and kinetic energy.
An aeroplane flying at a height has both potential and kinetic energy
Energy can neither be created nor destroyed.
It can only be converted from one form to another or transferred from one object to another.
Rubbing Palms produces heat energy.
The amount of work done
Depends on The force applied to do the work.
The distance travelled
Therefore work done= force X distance
Unit of Work
Unit of Force- Newton
Unit of Distance- Meter
Therefore, the unit of Work= Newton-meter
Newton-meter is also called Joule in the name of British scientist James Joule.
Work done in lifting mass to a height
Earth attracts the mass m with a force = mg
g is the acceleration due to gravity.
h is the distance through which the object has moved.