What is force ?????????
Answers
Answer:
The push or pull applied on an object is called force.
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☆ Answer ☆
A push or a pull that can change or affect the motion speed and safe of the body is called force.
Kinds of Forces :-
We come across various types of forces in nature. These can be classified as a contact forces and non - contact forces.
Contact forces are those which are applied by actually the body, that is, the object are in physical contact with each other, e.g. muscular force, mechanical force and frictional force.
Non - contact forces are those that at from a distance, that is, they act on the bodies without being touched visually, e.g. gravitational force, electrical force and magnetic force .
Contact Forces
As already stated, these act only when the objects are in physical contact with each other. These are:
1. Muscular force :-
It is the force exerted by our muscles, e.g. a rickshaw puller uses his leg muscles to move a rickshaw, a labourer uses the muscles of his arms and shoulders to lift the load. When we walk or run, we use muscular force. While pedalling a cycle, we use muscular force. This force either changes the position of an object or deforms it.
Sometimes animals also use muscular force to move the objects, e.g. a horse uses muscular force to move a cart, a donkey uses muscular force to carry load, a bull uses muscular force to move a plough and an elephant uses muscular force to move a log in the forest.
2. Mechanical Force :-
It is a push or pull exerted by a machine to move the body or to bring it to rest, e.a. the engine of the car exerts mechanical force to move it, a railway engine exerts a mechanical force to pull the train.
A machine does not exert a force by itself but it needs energy from other sources to exert a force. The force exerted by wind to move a sailboat is a by mechanical force. The fast-moving air exerts a mechanical force to blow away the roof.
3. Frictional force :-
It is defined as a force that offers resistance to motion. It comes into existence only when the surfaces with respect to each of two objects in contact move with respect to each other, e.g., when we stop pedalling a cycle, it gradually slows down and ultimately stops after travelling some distance.
Similarly, when we roll a ball on the plain ground, it stops after moving a certain distance. Hence, force of body in friction slows down the motion of a moving body in contact with the other body. When we push a heavy box, the force of friction opposes the motion and makes it difficult for us to push it.
4. Elastic force :-
It is a force that is produced when
1. the body is stretched and then released, e.g. a catapult causes a small stone to shoot out when it is stretched and released.
2. the body is compressed and then released, e.g. spring.
Non - Contact Forces
As already stated, these can act even when the objects are not in physical contact with each other and yet bring about changes. These are :-
1. Magnetic force :-
It is the force exerted by a magnet to pull magnetic materials towards it. A magnet attracts materials made of iron, cobalt and nickel.
2. Electricoal force :-
It is the force of attraction or repulsion between the two charged bodies.
3. Gravitational force :-
It is the force with which the earth pulls all the objects towards its centre, e.g. a ripe fruit falls towards the ground from a tree and water falls down the hills, etc.