Question

what is friction.gives its advantages and disadvantages?what is limiting friction​

Answer 1

Answer:

Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism

Explanation:

Advantages of friction:

1. Friction enables us to walk freely.

2. It helps to support ladder against wall.

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

4. Objects can be piled up without slipping.

5. Breaks of vehicles work due to friction.

Disadvantages of friction:

1.It always resists the motion, so extra energy is required to overcome it.

2.It causes wear and tear of machines.

3.It decreases the life expectancy of moving parts of vehicles.

4.Since friction is very useful in some cases while harmful in some cases, friction is called a necessary evil.

Answer 2

Answer:

Friction is the resistance to motion of one object moving relative to another. The force, which opposes the relative motion between two surfaces in contact is known as friction. It acts on both the surfaces.

The advantages of friction are

1)Being able to walk across a surface without slipping. (This is static friction).

2)Writing on a piece of paper with a pencil or a pen. (This is sliding friction).

3)Driving a car across the road surface. (This is rolling).

4)Jumping out of an airplane with a parachute

(This is fluid friction).

The disadvantages of friction are

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

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

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

4)Forest fires are caused due to friction between branches of trees.

limiting friction:The friction generated when two surfaces come in contact with each other is known as limiting friction.

(or)

The maximum friction that can be generated between two static surfaces in contact with each other. Once a force applied to the two surfaces exceeds the limiting friction, motion will occur.