Tag: friction

Questions Related to friction

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

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

  1. Magnetic force

  2. Electric charge

  3. Chemical force

  4. Frictional force

Show answer
Correct Option: D
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.

Which of the following is true for friction?

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

  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

Show answer
Correct Option: D
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.

State whether the given statement is true or false :

Friction is necessary to perform many tasks. 

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 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.

Friction is _____ in some situations.

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

  1. desirable

  2. undesirable

  3. both A and B

  4. none of the above

Show answer
Correct Option: C
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.

In what ways is friction harmful?

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

  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

Show answer
Correct Option: C
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.

The friction between two bodies produces

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

  1. Motion

  2. Expansion

  3. Heat

  4. None

Show answer
Correct Option: C
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.

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

Show answer
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

Show answer
Correct Option: D
Explanation:

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