Tag: friction

Quizzes (10) Questions (79)

Questions Related to friction

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

_______ helps in writing with a pen or pencil on a paper.

  1. Magnetic force

  2. Electric charge

  3. Chemical force

  4. Frictional force
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The irregularities between the paper and the pen or pencil create friction. Due to friction, the particles of ink or lead stick to the paper and get locked in its irregularities. If there would be no friction between the paper and pen or pencil, the ink/lead would not stick to the paper and we would not be able to write.

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 is true for friction?

  1. It is necessary to perform many tasks.

  2. It produces heat.

  3. It wears out the surfaces in contact.

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

Friction is important to perform many tasks. It also produces heat in the process and since the two surfaces keep rubbing against each other, they gradually wear out.

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

State whether the given statement is true or false :

Friction is necessary to perform many tasks. 

  1. True

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

Friction helps to lock the two surfaces in contact. 

However, if there was no friction, we would not be able to perform even simple tasks like writing on a paper, or fixing a nail in the wall, stopping or turning an automobile, or even something as simple as tying a lace knot. However, in some cases it is desirable to reduce friction but it can never be eliminated.

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 _____ in some situations.

  1. desirable

  2. undesirable

  3. both A and B

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Friction is both desirable and undesirable depending on the situation. For example, the tyres of an automobile are grooved to increase friction. However, the ball bearings in the same automobile are regularly oiled to reduce friction and ensure smooth functioning of the engine.

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.