Question

what is friction? Write different methods to prevent friction ?
Write advantages and disadvantages of friction?​

Answer 1

Answer:

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.

Different methods are as follows :-

1) By using lubricants: friction increases as the roughness of the surface increases. ...

2)Polishing surfaces: It makes the surfaces even and hence reduces friction.

3) By using ball bearings: Rotating machines can be mounted on ball bearings. ...

4) By streamlining: streamlining reduces the area of contact and thus reduces friction.

Explanation:

Advantages of friction:

Friction enables us to walk freely.

It helps to support ladder against wall.

It becomes possible to transfer one form of energy to another.

Disadvantages of friction:

Friction produces a lot of heat in various parts of the machinery and this leads to wastage of energy as heat.

Opposes motion, hence more energy is needed to overcome friction.

Noise production in machines is irritating as well as leads to energy loss.

Hope it helps, Mark Brainlist please☺☺

Answer 2

Answer

Friction is a force between two surfaces that are sliding,or trying to slide, across each other. Friction always works in the direction opposite to the direction in which the object is moving, or trying to move. Friction always slows a moving object down.

Different methods to prevent friction:

• Make the surface smoother. Rough surfaces produce more friction and smooth surfaces reduce friction.
• Lubrication is another way to make surface smoother.
• Make the object more streamlined.
• Reduce the forces acting on the surfaces
• Reduce the contact between the surface.

Advantages of friction

• Friction is responsible for many types of motion.
• It helps us walk on the ground.
• Brake in a car make use of friction to stop the car.
• Asteroids are burnt in the atmosphere before reaching the Earth due to friction.
• It helps in the generation of heat when we run our hands.

Disadvantages of friction

• Friction produces unnecessary heat leading to the wastage of energy.
• The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving object.
• Forest fires are caused due to the friction between tree branches.
• A lot of money goes into preventing friction and the usual wear and tear caused by it by using techniques like greasing and oiling.

I hope this helps you...