Question

what is friction???​

Answer 1

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.

Answer 2

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• Friction is a contact force, applied between two surfaces that have relation motion.

• Friction always opposes the relative motion by applying a force in opposite direction.

• It is a self adjusting force. It first increases with the application of external force and then becomes constant by attaining a maximum possible force.

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TYPES OF FRICTION :-

➠ Rolling Friction

• It is the resistance produced when a rolling body moves over a surface.
• Rolling friction has a lesser magnitude than sliding friction.
• Example :- small wheels in the suitcase

➠ Sliding Friction

• This is the frictional force between two surfaces when one body or object moves or attempts to move over the other.
• Sliding friction is the moment of force required to retain the state of motion of the moving object at the same speed.
• Example :- When you apply force to an already moving box to keep it moving on the floor it with the same speed.

➠ Static Friction

• It is the friction that works between two surfaces which are in contact, but there is no relative movement between them.
• Static friction is the amount of force applied at the instànt when an object starts moving from its state of rest.
• Example :- when you push a heavy box on the floor, the force that you apply to start it moving on the floor.

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