Tag: merits and demerits of friction and methods to reduce it

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

In what ways is friction harmful?

  1. It causes wear and tear to the surfaces.

  2. Much energy is lost in overcoming friction.

  3. Both A and B

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Friction comes into play when two irregular surfaces come in contact. The continuous rubbing of these surfaces together causes it to gradually wear out. Also, much of the applied force or energy is wasted in overcoming the force of friction. Hence, it is considered as evil, but it is necessary too.

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

The friction between two bodies produces

  1. Motion

  2. Expansion

  3. Heat

  4. None
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The friction is a force which occurs between two bodies, when say one of them is at motion/ or at both of them in a motion. The rubbing of hand is an example of friction which causes warm feeling in hands.

Multiple choice physics friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it friction: 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.

  1. more than

  2. less than

  3. same as

  4. having no relation with
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Which of the below statements prove that friction is disadvantageous?

  1. Tyres of cars wear out

  2. Soles of shoes wear out

  3. Machine parts wear out

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Which of the following statements is NOT true?

  1. Friction makes things slow down

  2. Friction produces heat

  3. Friction can stop moving objects

  4. Friction is not useful
Reveal answer Fill a bubble to check yourself
D Correct answer
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. 

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

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

  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
Reveal answer Fill a bubble to check yourself
A,C Correct answer
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 .

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

Friction is a that opposite motion?

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.