What is Non-Contact Force

In the last article we discussed the basics of force and one of its type, that was Contact Force. In this post here we are going to talk about the Non-Contact force and their major examples.

When you jump, you always return back to the surface. Why? Is there anything that is holding your feet when you try to jump? When you throw a ball high up in the air, it reaches the highest point and then it invariably return back to its thrower on the ground. These occurrences can be explained by the non-contact force. A non-contact force is a force applied to an object by another body that is not in direct contact with it. Non-contact forces come into play when objects do not have physical contact between them or when a force is applied without any interaction. When compared to the types of contact forces, there are very few non-contact forces.

Types of Non-Contact Forces

Gravitational Force: Gravitational force is responsible for bringing the items we toss into the air back to earth. When an object is resting on a surface it is exerting a downward force equal to its weight and this downward force is known as Gravitational force.

Non-Contact Force

The gravitation is a force of attraction that exists between all bodies that have mass. The gravitational force of the sun keeps the Earth and all the other planets of the solar system is a fixed orbit. Gravitational force does not need to be in contact to exert its downward force.

Electrostatic Force: The electrostatic force is very similar to gravitational force, the difference here being that gravitational force acts between masses and electrostatic force acts between two charged bodies.

Non-Contact Force

If you rub a comb on your clothes and then hold it near tiny pieces of paper you will see the bits of paper standing on their end attracted to the comb. We are made of tiny positive, negative and neutral particles. The opposite charges attract each other and like charges repel. This is the result of electrostatic forces.

Magnetic Force: Have you ever used a magnet? Doesn’t it feel like magic? If you ever have two magnets, try joining their ends. In one case, the ends will attract each other vigorously. In another case, no matter how hard you try, the ends will never make contact.

Non-Contact Force

Even if you push the ends together, the second you leave it, it will bounce off. This is the result of Magnetic force. Magnetic force is also responsible for the attraction of iron by a magnet. The magnetic force exerted by a magnet decreases with the increase in the distance from a magnet. Read what is a Force and other types of forces like Contact Force.

Practise This Question

The turn ratio of a transformers is given as 2 : 3. If the current through the primary coil is 3 A, thus calculate the current through load resistance