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Standard VIII
Physics
Polishing Surfaces in Contact to Change Friction
Question

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

A
2 & 3 only
B
1, 2 & 3
C
1 & 2 only
D
1 & 3 only
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Solution
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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.

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Similar Questions
Q1
Which of the following is used to reduce friction :
1. Streamlines
2. Use of ball bearings
3. Lubrication
View Solution
Q2
Choose the correct statement from the following:

1. Grease is used to reduce friction in the bicycle chain.
2. Ball bearings are used to reduce friction in a fan.
3. Oil is used to increase friction in car parts.
4. Talcum powder is used to reduce friction on a carrom board.

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Q3
Which of the following should be used to reduce friction on a carrom board?
(a) a lubricating oil
(b) a dry lubricant
(c) a layer of grease
(d) a ball bearing
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Q4

Of the following statements choose the correct statement :
A) Grease is used to reduce friction in the bicycle chain.
B) Ball bearings are used to reduce friction in a fan.
C) Oil can be used to increase friction in a car engine.
D) Talc can be used to reduce friction in a carrom board.


View Solution
Q5
Friction can be increased by
(a) using ball bearings between the two surfaces.
(b) making the surfaces rough.
(c) lubricating the surfaces.
(d) using streamlined shapes.
View Solution