Tag: advantages and disadvantages of friction

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Multiple choice physics friction increasing and reducing friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it

The substance that helps to ______ friction are called lubricants.

  1. increase

  2. decrease

  3. create

  4. eliminate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Oils, grease, graphite, etc., are examples of lubricants. These form a thin layer between the two surfaces in contact thus avoiding them from scrubbing directly against each other. This makes the movement smooth and reduces friction.

Multiple choice physics friction increasing and reducing friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it

Why are the tyres of automobiles grooved?

  1. To improve the design

  2. To increase friction

  3. To make it durable

  4. To make it strong
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If the tyres of automobiles were smooth, the friction produced would be minimal and thus, it would be difficult to stop or turn the automobile, increasing the risk of accidents. Hence, the tyres are grooved so as to increase the friction between the tyre and the surface of the road.

Multiple choice physics friction increasing and reducing friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it

Kabaddi players rub their hands with soil so that they can :

  1. make their skin dry

  2. moisture the hands

  3. get a better grip while holding the opponent

  4. soil the opponent
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

By rubbing their hands with soil, they make their hands rough. A rough surface has more friction which enhances their grip while holding the opponent.

Multiple choice physics friction increasing and reducing friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it

Which of the following are done to reduce friction?
a) Making grooves in the shoes
b) Polishing rough surfaces
c) Using wheels, ball bearings
d) Creating an air cushion

  1. a, b and c

  2. c and d

  3. b, c and d

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Making grooves in the shoes increases friction.
Polishing rough surfaces makes it smooth, thus reducing friction. 
Wheels and ball bearings create rolling friction which has the least magnitude compared to sliding and static friction.
Air cushion makes a layer of air between two surfaces, which helps in reducing friction.
Multiple choice physics friction increasing and reducing friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it

How do brake pads help in stopping an automobile?

  1. Brake pads press on the wheel and increase friction.

  2. Due to braking, the air pressure increases and the wheels stop.

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The brake pads press on the wheels and increase the friction since the surface of the brake pads and the wheels are irregular, and the rough surface increases friction that opposes the motion of the wheel.

Multiple choice physics friction increasing and reducing friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it

Which of the following are done to increase friction?

  1. Greasing the machines

  2. Treading the tyres

  3. Sprinkling powder on the carom board

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

The tyres are treaded to make it rough so that the frictional force increases when it comes in contact with the road. 

All others are done to decrease friction.

Multiple choice physics friction increasing and reducing friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it

The steps for decreasing friction includes:

  1. ball bearing used in moving parts of a machine

  2. the streamlined shape of an aircraft

  3. the layer of air between the hull of a hovecraft

  4. none of these
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

1) As rolling friction is less than sliding friction the shafts are fixed on ball bearing so that so that friction is reduced considerably.

2) The friction due to air is reduced by making the automobiles streamlined. Streamline shape allows more air and water to flow easily which offers least resistance.
3) Another way of reducing friction is to separate surfaces by air. This principle is used in hovecraft. The layer of air reduces friction allowing aircraft to move easily.

Multiple choice physics friction increasing and reducing friction advantages and disadvantages of friction merits and demerits of friction and methods to reduce it

In a large commercial complex there are four ways to reach the main road. One of the path has loose soil, the second is laid with polished marble, the third is laid with bricks and the fourth has gravel surface. It is raining heavily and Paheli wishes to reach the main road. The path on which she is least likely to slip is:

  1. loose soil

  2. polished marble

  3. bricks

  4. gravel surface
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Loose soil will provide the maximum friction and hence less chances of slipping.