Tag: friction: a necessary evil

Questions Related to friction: a necessary evil

In absence of friction

physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

  1. our shoes will remain intact

  2. we will not be able to walk

  3. we will be able to slide smoothly

  4. all the above will happen

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Correct Option: D
Explanation:

Our shoes encounter wear and tear due to friction. 
We are able to walk due to friction.
Friction resists us from sliding.

State whether the given statement is true or false :

Friction is a necessary evil.

physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Friction is necessary in our daily life. But it is an evil as it causes heating and wear and tear. So, it is a necessary evil.

The taxi driver has to be more careful when driving car in winter because of morning dew. That means the friction on road during winter is _______ friction during summer. Fill in the blank.
physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

  1. more than

  2. less than

  3. same as

  4. having no relation with

Show answer
Correct Option: B
Explanation:

A car moves forward due to friction and also can be controlled on road due to friction. In winter, due to morning dew, friction decreases and the  driver has to be careful. Due to presence of dew, friction in winter is less than that in summer.

Which of the following is not a type of friction?

physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

  1. Fluid

  2. Rolling

  3. Sliding

  4. Lifting

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Correct Option: D
Explanation:

Lifting is not a type of friction. All others are types of friction.

Which of the below statements prove that friction is disadvantageous?

physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

  1. Tyres of cars wear out

  2. Soles of shoes wear out

  3. Machine parts wear out

  4. All of the above

Show answer
Correct Option: D
Explanation:

All of the above is correct answer. As we know friction is useful but in other means it is also disadvantageous or we can say an evil which is a necessity. Whenever there is movement between two parts of machinery or whenever there is contact between shoes sole and rough road, the parts in contact wear out. Friction causes wear and tear of parts as well as heat is produced which damages the parts.

Which of the following statements is NOT true?

physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

  1. Friction makes things slow down

  2. Friction produces heat

  3. Friction can stop moving objects

  4. Friction is not useful

Show answer
Correct Option: D
Explanation:

The statement that friction is not useful, is not true. Friction is advantageous in our daily life. Without friction we will not be able to walk properly, nor drive vehicles etc. 

Frictional force is important for motor racing. This is because frictional force.

physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

  1. can help a car to slow down

  2. can help a car to move faster

  3. can help a car move around the comers without skidding

  4. none of New

Show answer
Correct Option: A,C
Explanation:

Frictional force can help a car to slow down and can help to move around the corners without skidding due to the frictional force between tyres and ground . Without friction , brakes of the car will not work and it will be impossible to control the car , due to this we say friction is a necessary evil .

Friction is a that opposite motion?

physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Friction force is the force that opposes the relative motion of an object or the direction opposite to the tendency of relative motion due to the contact of 2 rough surfaces. Hence it is exactly opp to the direction of relative motion of the object.

Statement I: If friction is not present In nature. then life will be easy.
Statement II: Without friction. there would be no reaction from ground.
  

physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

  1. Statement I is correct and Statement II is incorrect.

  2. Statement II is correct and Statement I is incorrect.

  3. Both Statements I and II are correct and Statement II explains Statement I

  4. Both Statements I and II are correct but Statement II does not explain Statement

Show answer
Correct Option: A

Which of the following statements is NOT true for friction force?

physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: a necessary evil

  1. Friction force is produced when two objects rub against each other

  2. A lighter object will experience a smaller frictional force

  3. Friction produces more wear and tear

  4. Friction is harmful

Show answer
Correct Option: D
Explanation:

ADVANTAGES OF FRICTION
Friction plays a vital role in our daily life. Without friction we are handicap.
1. It is becomes difficult to walk on a slippery road due to low friction. When we move on ice, it     becomes difficult to walk due to low friction of ice.
2. We can not fix nail in the wood or wall if there is no friction. It is friction which holds the nail.
3. A horse can not pull a cart unless friction furnishes him a secure Foothold.
DISADVANTAGES OF FRICTION 
Despite the fact that the friction is very important in our daily life, it also has some disadvantages like:
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.
2. Due to friction we have to exert more power in machines.
3. It opposes the motion. 
4. Due to friction, noise is also produced in machines.
5. Due to friction, engines of automobiles consume more fuel which is a money loss.
So, Friction is useful for braking moving vehicles; for walking in smooth / slippery surfaces like snow and sand.
Answer (D) friction is harmful