Define Friction and Explain it's all …

Friction is defined as the force that opposes the motion of a solid object over another. There are mainly four types of friction: static friction, sliding friction, rolling friction, and fluid friction. Friction and normal force are directly proportional to the contacting surfaces and it doesn’t depend on the hardness of the contacting surface. With the increase in relative speeds, the sliding friction reduces whereas fluid friction increases with the increase in the relative speed, also fluid friction is dependent on the viscosity of the fluid.

Following are the friction types which depend on the types of motion:

1. Static Friction: Static friction is defined as the frictional force that acts between the surfaces when they are at rest with respect to each other.
2. Sliding Friction: Sliding friction is defined as the resistance that is created between any two objects when they are sliding against each other.
3. Rolling Friction: Rolling friction is defined as the force which resists the motion of a ball or wheel and is the weakest types of friction.
4. Fluid Friction: Fluid friction is defined as the friction that exists between the layers of the fluid when they are moving relative to each other.