## What are the disadvantages of friction explain with examples?

1. The main disadvantage of friction is that it produces heat in various parts of machines. In this way some useful energy is wasted as heat energy. Due to friction, engines of automobiles consume more fuel which is a money loss.

## What are the main causes of friction?

Causes of Friction: Friction is a force that resists the relative motion between two objects or materials. The causes of this resistive force are molecular adhesion, surface roughness, and deformations. Adhesion is the molecular force resulting when two materials are brought into close contact with each other.

## Is friction affected by mass?

Friction can’t affect mass of a substance(considering for a substance whose mass doesn’t change with time),rather it is the mass of an object which can affect friction variously. Let’s take some example to understand the situation. So,higher the mass of the object,higher will be the frictional force.

## Why are insects regarded as necessary evil?

Due to the process of transpiration, there is pressure on the plant for the absorption of water. Therefore, the process of transpiration is called a necessary evil.

## Does heat reduce friction?

The result shows that the temperature has important effect on the friction properties. The friction coefficient decreased slowly and became not smooth with the temperature rising. The wear rates have great increase with the temperature rising for the cumulative friction heat.

## Where is friction not necessary?

Examples where friction is not useful : The crumpled paper falls faster because there is less air resistance acting on the paper. Friction can be useful. For example, friction between our shoes and the floor stop us from slipping and friction between tires and the road stop cars from skidding.

## Why friction is a necessary evil?

Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. Hence it is considered as a evil. But almost all crucial tasks cannot be carried out without the presence of friction. Hence it is considered as a necessary evil .

## What are the 5 advantages of friction?

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

## Who said necessary evil?

In Common Sense, Thomas Paine described government as at best a “necessary evil”.

## What are some disadvantages of friction?

Three disadvantages of friction are :

• Friction produces heat which damages the moving parts of a machine.
• Friction produces wear and tear on the contacting surfaces. This reduces the life of machine parts, tyres and shoe soles.
• A lot of energy is wasted in overcoming the friction before an object starts moving.

## Where is friction useful?

Helpful frictional forces For example: friction between our shoes and the floor stop us from slipping. friction between tyres and the road stop cars from skidding. friction between the brakes and wheel help bikes and cars to slow down.

## Is friction proportional to speed?

For friction in fluids (air, water etc.) There the frictional force is proportional to the velocity for small velocities. That proportionality breaks down when the velocity becomes larger. In particular, it breaks down (and the drag goes up more rapidly) when something called the Reynolds’ number becomes large.

## Why is plastic a necessary evil?

Plastic is now considered to be a necessary evil: we don’t want to live with it, but we can’t live without it either. We have become more environmentally aware than ever, so we are desperately trying to reduce our use of plastics.

## Does friction depend on speed?

Friction is a contact force when two surfaces interact. Notice that both of these friction formulas ONLY depend on the coefficient of friction and the normal force. It does not depend the area of contact, it doesn’t depend on the sliding speed.

## Does friction cause heat?

You know that friction produces heat. Friction causes the molecules on rubbing surfaces to move faster, so they have more energy. This gives them a higher temperature, and they feel warmer. Heat from friction can be useful.

## Which article is known as Necessary Evil?

Notes: The provisions regarding preventive detention under Article 22 (3) are called necessary evil because it provides for curtailment of liberty for reasons of State’s security; public order, disruption of national economic discipline, etc.

## How is friction beneficial in daily life?

We see friction in our day to day activities. Walking –We can walk only if we apply frictional force. Friction is what holds your shoe to the ground. The friction present on the ice is very little, this is the reason why it is hard to walk on the slippery surface of the ice.

## What are 3 types of friction?

The reason we are able to control cars at all is because of friction between the car’s tires and the road: more accurately, because there are three kinds of friction: rolling friction, starting friction, and sliding friction.