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Smooth surfaces have more friction than rough surfaces. 

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Important Questions on Forces and their Effect

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Science>Physics>Forces and their Effect>Friction
Explain why, wheels are so useful.
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Science>Physics>Forces and their Effect>Friction
The friction between two surfaces does not depend on one of the following. This one is:
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Science>Physics>Forces and their Effect>Friction
A car is moving towards North. What will be the direction of force of friction acting on this car due to surface of road?
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Science>Physics>Forces and their Effect>Friction
Explain why, it is easier to drag a mat on floor when nobody is sitting on it but much more difficult to drag the same mat when a person is sitting on it.
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Science>Physics>Forces and their Effect>Friction
What are fluids? Name two common fluids.
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Science>Physics>Forces and their Effect>Friction
The frictional force exerted by a fluid is called:
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Science>Physics>Forces and their Effect>Friction
What is meant by lubrication? Why is it important?
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Science>Physics>Forces and their Effect>Friction
Friction is not a force.
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Science>Physics>Forces and their Effect>Friction
Give examples to show that friction depends on the nature of two surfaces in contact.
 
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Science>Physics>Forces and their Effect>Friction
You spill a bucket of soapy water on a marble floor accidentally. Would it make easier or more difficult for you to walk on the floor? Why?
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Science>Physics>Forces and their Effect>Friction
What is drag? Give two examples of a drag force.
 
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Science>Physics>Forces and their Effect>Friction
A big wooden box is being pushed on the ground from east to west direction. The force of friction due to the ground will act on this box towards _____.
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Science>Physics>Forces and their Effect>Friction
Which of the following should be used to reduce friction on a carrom board?
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Science>Physics>Forces and their Effect>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>Forces and their Effect>Friction
Why are machine parts oiled?
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Science>Physics>Forces and their Effect>Friction
A boy runs his toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be:
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Science>Physics>Forces and their Effect>Friction
Friction acts in a direction opposite to that of the movement of an object. 
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Science>Physics>Forces and their Effect>Friction
Why do we sprinkle powder on the carrom board before playing carrom?
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Science>Physics>Forces and their Effect>Friction
When a pencil cell is released from a certain point on an inclined wooden board, it travels a distance of 35 cm on floor A before it comes to rest. When the same pencil cell is released from the same point on the same inclined board, it travels a distance of 20 cm on floor B before coming to rest. Which floor, A or B, offers greater friction? Give reason for your answer.
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Science>Physics>Forces and their Effect>Friction
A spring balance can be used to measure:
(A) Mass of an object
(B) Force acting on an object
(C) Density of an object
(D) Weight of an object