a contact force that stops a moving object or makes the stationary object to move is called friction

Frictional Force (Friction)

Friction is a force that opposes the relative motion or tendency of such motion of two surfaces in contact. It is caused by the irregularities in the surfaces of objects that come into contact with each other. Frictional force plays a crucial role in our daily lives, as it affects the movement of objects on surfaces.

Types of Friction
There are mainly two types of friction: static friction and kinetic friction. Static friction occurs when two surfaces are at rest relative to each other, while kinetic friction occurs when the surfaces are in motion.

Factors Affecting Friction
1. Surface roughness: Rough surfaces create more friction compared to smooth surfaces.
2. Normal force: The force pushing the two surfaces together affects the frictional force.
3. Type of material: Different materials have different coefficients of friction, affecting the resistance between surfaces.

Importance of Friction
Friction is essential for various applications such as walking, driving vehicles, writing with a pen, and many more. It helps in gripping objects, stopping moving objects, and providing traction.

Ways to Reduce Friction
1. Lubrication: Adding a lubricant between surfaces reduces friction.
2. Smoothing surfaces: Polishing or smoothing surfaces can decrease friction.
3. Using ball bearings: Rolling objects reduce friction compared to sliding objects.

In conclusion, frictional force is a crucial aspect of our everyday lives, affecting the movement and interaction of objects on surfaces. Understanding the factors affecting friction can help in optimizing processes and reducing wear and tear on surfaces.