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When one body rolls over the surface of another body, the resistance to its motion is called the:

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Important Questions on Force and Pressure

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Is there a force of friction between the wheels of a moving train and iron rails? If yes, name the type of friction. If an air cushion can be introduced between the wheel and the rail, what effect will it have on the friction?
 
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Science>Physics>Force and Pressure>Types of Friction
Rolling friction is _____ than sliding friction.
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Science>Physics>Force and Pressure>Types of Friction
Out of sliding friction, static friction and rolling friction:
Which one is the smallest?
 
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Science>Physics>Force and Pressure>Types of Friction
Which is easier to move?
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Science>Physics>Force and Pressure>Types of Friction
What kind of friction does a wheel have with the surface on which it is moving?
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Science>Physics>Force and Pressure>Types of Friction
Four children were asked to arrange forces due to rolling, static and sliding friction in decreasing order. Their arrangements are given below. Choose the correct arrangement.
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Science>Physics>Force and Pressure>Types of Friction
A father and son pushed their car to bring it to the side of road as it had stalled in the middle of the road. They experienced that although they had to push with all their might initially to move the car, the push required to keep the car rolling was smaller, once the car started rolling. Explain.
 
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Science>Physics>Force and Pressure>Types of Friction
Which of these is an example of rolling friction?
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Science>Physics>Force and Pressure>Types of Friction
Rolling friction is _____ [more/less] than sliding friction.
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Science>Physics>Force and Pressure>Types of Friction
Which type of friction comes into play when a book kept on cylindrical pencils is moved by pushing?
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Science>Physics>Force and Pressure>Types of Friction

What kind of friction comes into play:

When a block of wood kept on cylindrical iron rods moves? 

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Science>Physics>Force and Pressure>Types of Friction
Sliding friction _____.
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Science>Physics>Force and Pressure>Types of Friction
Differentiate between sliding friction and rolling friction.
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Science>Physics>Force and Pressure>Types of Friction

Two friends are trying to push a heavy load as shown in Figure. Suggest a way which will make this task easier for them.

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Science>Physics>Force and Pressure>Types of Friction
What is meant by ‘rolling friction’?
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Science>Physics>Force and Pressure>Types of Friction
Rolling _____ (reduces/increases) friction.
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Science>Physics>Force and Pressure>Types of Friction
Cotyledons are also called-
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Science>Physics>Force and Pressure>Types of Friction
Which of the following statements is incorrect?
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Science>Physics>Force and Pressure>Types of Friction
Providing wheels on a moving body helps in
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Science>Physics>Force and Pressure>Types of Friction
How can a very heavy machine be moved conveniently from one place to another in a factory? (No crane is available for this purpose).