Question

Wjat is non contact force ......

Answer 1

Non - Contact Force:

A force which can be applied without any contact with two bodies is called a non contact force.Following are the examples of non contact force.

Types of contact forces

• Magnetic Force
• Gravitational Force
• Electrostatic Force

Magnetic Force

The force exerted by a magnet is called a magnetic force. e.g. Like poles of magnet repel each other , while unlike poles attract each other. These forces exist without a contact between the two magnets. e.g.

1. Magnet attracts Cobalt, Nickel, Iron and Steel Towards itself
2. When two magnets are bought near then South-south,North-north poles repel each other. While North-south,South-north attract each other.

Electrostatic Force

The force exerted by a charged body is called a electrostatic force. e.g. Like charges repel each other , while unlike charges attract each other. These forces exist without a contact between the two bodies. e.g.

1. When a comb is run through dry hair, then the comb can attract small pieces of paper.
2. If we bring a charged comb near our hair, they rise towards comb.
3. Charge is developed on synthetic fiber due to rubbing.
4. We can hear cracking sound of sparks when taking off or putting on woolen or synthetic clothes.

Gravitational Force

The force exerted by the earth on a body is called gravitational force. Actually this force exists between any two bodies in the universe.This force is always of attraction. e.g. When a body is dropped from a height it moves in downward direction towards the Earth with increasing speed (with constant acceleration). This constant acceleration by which all bodies fall down is called acceleration due to gravity. Its value is 9.8 m/s² (approx 10  m/s² )on the surface of the earth. e.g.

1. A fruit from tree falls down
2. Water falls down on a ground from a tap
3. We feel the weight of bucket full of water holding in our hand.