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Explain Force and Friction?
Force
A force is a push or pull of an object that causes it to change velocity (to accelerate). Whenever there is an interaction between two objects, there is a force exerted on each of the objects.
The S.I unit of Force is Newton.
The formula for force implies that force is equal to mass multiplied by acceleration.
F = m $ \times $ a
Force is divided into two broad categories:
i)Contact Forces ii)Action at a distance Forces
1.Tension Force 1.Gravitational Force
2.Normal Force 2.Electrical Force
3.Contact Force 3.Magnetic Force
4.Frictional Force
5.Air Resistance Force
6.Applied Force
7.Spring Force
Friction
Friction is an opposing force that exists between two surfaces which are in contact. It helps us a lot in doing many activities.
There are 4 types of friction.
1) Static friction
This friction occurs when two or more solid objects rest on the ground, and not moving relative to each other.
This friction prevents an object from sliding down a sloped surface.
For example, A vehicle parked on a hill, A book on a table.
2) Sliding friction
This friction occurs when a body slides on the ground.
For example, while writing with a pencil the pencil lead slides on the paper. The friction between lead and the paper is good enough to leave a watermark on the paper.
3) Rolling friction
This type of friction occurs between rolling objects and the ground.
For example, the friction between the tires and the ground, etc.
4) Fluid friction
It is a friction that occurs when objects move across or through a fluid.
For example, while swimming, the friction of water helps the swimmer to swim.
If there is no friction, we would slide on the ground. The friction present in the atmosphere helps in vapourising the minute particles that come from space. Therefore, there is a lot of importance of friction in our daily life.
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