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 __________.
$(d)$. A sprinkling of powder on the carrom board ________ friction.
$(e)$. Sliding friction is _________ than the static friction.

AcademicPhysicsNCERTClass 8

To do:

We have to fill in the blanks.

Solution:

$(a)$. Friction opposes the $\underline{relative\ motion}$ between the surfaces in contact with each other.

$(b)$. Friction depends on the $\underline{nature}$ of surfaces.

$(c)$. Friction produces $\underline{heat}$ .

$(d)$. Sprinkling of powder on the carrom board $\underline{reduces}$ friction.

$(e)$. Sliding friction is $\underline{less}$ than static friction.

Explanation:

When a body moves on a surface, a force acts on the body that tends to oppose its motion and it is called friction. Friction acts in the opposite direction of the motion. When a body is at the rest on a surface, the friction acting between the body and the surface is called static friction. While the body moves over a surface, the friction acting on the body is called sliding friction. Sliding friction is always less than static friction. Friction occurs between the two surfaces when an object or body is moved over the surface of another object. thus, heat is produced when friction occurs due to rubbing. Sprinkling of powder on the carrom reduces the friction as it makes the carrom board smoother and friction decreases on the smooth surfaces.

raja
Updated on 10-Oct-2022 13:24:47

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