MEDIUM
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Oil applied to a surface to reduce friction better serves as a :

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Important Questions on Force and Pressure

EASY
Science>Physics>Force and Pressure>Methods to Reduce Friction
What is the purpose of using ball bearings in machines?
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Science>Physics>Force and Pressure>Methods to Reduce Friction
Why do brake pads of bicycles have to be replaced quite often?
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Science>Physics>Force and Pressure>Methods to Reduce Friction
Which of the following statements is incorrect?
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Science>Physics>Force and Pressure>Methods to Reduce Friction
Which force gets reduced when the two surfaces in contact are polished to make them smooth?
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Science>Physics>Force and Pressure>Methods to Reduce Friction
Why are lubricants (oil or grease) applied to rubbing surfaces of machines?
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Science>Physics>Force and Pressure>Methods to Reduce Friction
What is meant by lubrication? Why is it important?
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Science>Physics>Force and Pressure>Methods to Reduce Friction
Why are treads made in the surface of tyres?
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Science>Physics>Force and Pressure>Methods to Reduce Friction
Cotyledons are also called-
MEDIUM
Science>Physics>Force and Pressure>Methods to Reduce Friction
Explain with the help of diagrams, how the use of oil reduces friction between two surfaces in contact with each other.
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Science>Physics>Force and Pressure>Methods to Reduce Friction
Ball-bearing is a device that usually converts:
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Science>Physics>Force and Pressure>Methods to Reduce Friction
Car wheels often spin on icy roads. Explain why.
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Science>Physics>Force and Pressure>Methods to Reduce Friction
What is meant by ‘rolling friction’?
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Science>Physics>Force and Pressure>Methods to Reduce Friction
Explain why, sportsmen use shoes with spikes.
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Science>Physics>Force and Pressure>Methods to Reduce Friction
Why do we sprinkle fine powder on carrom board?
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Science>Physics>Force and Pressure>Methods to Reduce Friction
Which of the following should be used to reduce friction on a carrom board?
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Science>Physics>Force and Pressure>Methods to Reduce Friction
Explain why, wheels are so useful.
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Science>Physics>Force and Pressure>Methods to Reduce Friction

(a) Name two magnetic poles which attract each other.

(b) Name two magnetic poles which repel each other.

MEDIUM
Science>Physics>Force and Pressure>Methods to Reduce Friction
Why are machine parts oiled?
MEDIUM
Science>Physics>Force and Pressure>Methods to Reduce Friction
How will you reduce friction between those machine parts which rub against each other? Give the simplest method.
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Science>Physics>Force and Pressure>Methods to Reduce Friction
Why is the surface of a slide polished to make it smooth?