Learn Class 8 Science - Friction

What is Friction? And what are the various factors which affect it? Are you curious to know more about things in detail?

About Friction

• The friction force is also known as an external force.
• It is the force that opposes relative motion.
• LIKE: oppose between two surfaces.
• Act only when it comes in touch with the bodies.

Types of Friction

Sliding Friction:

• One which opposes the slide motion.
• More minor as compared to static friction.

Static Friction:

• The friction which is in 'rest.'
• Force: 'Always equal & opposite to applied force.'

Rolling Friction:

• Friction is present in two forces.
• Smaller than sliding friction.

Effects of Friction

Friction:

• It helps in the generation of heat.
• It is always in motion.
• Friction does wear and tear in tires.

Factors affecting Friction:

• Nature of surface.
• Polishing surfaces.
• Normal reaction force.
• Kinetic friction.
• Spring balance.

These are factors that affect the frictional force. So make sure to keep all of the things in safe mode.

Pros:

• The friction helps us to write on paper.
• The friction helps to move on a road. I.e., friction between two surfaces.
• Offer resistance to the actual motion.

Cons:

• Wastage of energy.
• The speed of the items becomes low.

Learning Videos for 8th Grade Science - Friction