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Force is push or pull acting on a body which tends to change its state of rest or of motion.
It is denoted by "F".
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Additional information-
SI unit of force is Newton(N).
C.G.S (centimetre gram second) unit of force is dyne.
The direction in Which the body is pushed or pulled is called direction of the force.
Effects of force -
A force can change the direction of a moving object.
A force can change the shape and size of an object.
A force can change the speed of a moving object.
A force acting on a body can change its state of motion or rest.
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Food: The first and most important need of the humans (or any living organism) is food. But with the production of food rising by arithmetic progression and population growing by geometric progression i.e. the number at each step is being multiplied. At the same time growing population is increasing the use of more and more agricultural land to build houses. Thus it is evident that food would be running short for the unchecked rising population.