Tag: friction

Quizzes (10) Questions (79)

Questions Related to friction

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.

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 is used to reduce friction :
1. Streamlines
2. Use of ball bearings
3. Lubrication

  1. 1 & 2 only

  2. 1 & 3 only

  3. 2 & 3 only

  4. 1, 2 & 3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All the mentioned option are correct.

Streamlines reduces the friction in fluid.
Use of ball bearing reduces the friction in machines rotating parts.
Lubricants are used in machines  and moving parts to reduce friction.

Option D is correct.

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 efforts made to reduce friction?

  1. Energy is lost in overcoming friction.

  2. Overcoming friction is a time consuming process.

  3. Both A and B

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

A lot of the applied energy is lost in overcoming friction so as to put a body in motion.Hence efforts are made to reduce friction.

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

Why do we sprinkle powder before playing caroms?

  1. To increase friction

  2. To decrease friction

  3. To increase or decrease the friction depending on the type of the game played.

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

Powder acts as a lubricant to the surface and reduces friction so that the game can be carried on smooth surface.

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

To keep machines running smoothly and to avoid wear and tear of machines, the best and the most commonly used lubricant is:

  1. Powder

  2. Sand

  3. Oil

  4. Water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oil is the best and the most commonly used lubricant used for keeping machines running smoothly and to avoiding wear and tear of machines as it reduces the friction more effectively.