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Hii dear students today we are going to discuss about new concept.

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For example, when you try to push a book along the floor, friction makes this difficult.

When we try to move a body by applying a force parallel to their surfaces, an opposing  force is experienced.

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Didn't you notice the figure?
Forces can affect your running greatly. Forces can slow you down, speed you up and can even bring you pain if you do understand whats happening.
What may be the reason??
When you are running the most important force that you should understand is friction.
Friction is a force that opposes movement between two objects, but for runners friction makes you faster.

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When a body moves or tends to move on the surface of another body,  a forcevis experienced parallel to the surface which opposes the relative motion between them. This is friction.

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https://youtu.be/9XtGJXVnQxk

For a moving solid body, there are two principal types of friction that act upon it:

The force resisting the motion of a rolling body on a surface is known as rolling friction or rolling resistance. Rolling of ball or wheel on the ground is an example of Rolling friction.

The other type of friction is sliding friction. In this type of friction, there is a restriction on the body’s movement as only one side of the body is in contact with the surface. Pushing a box across the table is an example of Sliding friction.

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•Friction enables us to walk freely.
• It helps to support ladder against wall.
• It becomes possible to transfer one form of energy to another.
• Objects can be piled up without slipping.
• Breaks of vehicles work due to friction.
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•It always resists the motion, so extra energy is required to overcome it.
• It causes wear and tear of machines.
• It decreases the life expectancy of moving parts of vehicles.
• Fuel loss
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Find more situtions and expand it....
You might have understood the advantages and disadvantages of friction.
What are the different methods to reduce friction??
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Observe the picture below and find more methods..

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https://youtu.be/M8LlytVuABA

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Fill in the blanks.

(a) Friction opposes the _____________ between the surfaces in contact with each other.

(b) Friction depends on the _____________ of surfaces.

(c) Friction produces __________.

(d) Sprinkling of powder on the carrom board ________ friction.

(e) Sliding friction is ___________ than the static friction.