prove that force of friction is depended on the nature of two surfaces
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The force due to friction is generally independent of the contact area between the two surfaces. This means that even if you have two heavy objects of the same mass, where one is half as long and twice as high as the other one, they still experience the same frictional force when you drag them over the ground. This makes sense, because if the area of contact doubles, you may think that you should get twice as much friction. But when you double the length of an object, you halve the force on each square centimeter, because less weight is above it to push down. Note that this relationship breaks down when the surface area gets too small, since then the coefficient of friction increases because the object may begin to dig into the surface.
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Make an inclined plane on a smooth
floor, or on a table. You may use
a
wooden board supported by bricks,
or books. Put a
mark
with a pen at any point A on the
inclined plane. Now let a pencil
cell
move down from this point. How far
does it move on the table
before
coming to rest? Note down the
distance. Now spread a piece of
cloth
over the table. Make sure that there
are no wrinkles in the cloth. Try
the
activity again
Repeat this activity by spreading
a thin layer of sand over the
table.
Maintain the same slope
throughout the activity.
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