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Q. 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.
Solutions:-
(a) Friction opposes the _____________ between the surfaces in contact with each other.
Answer. Motion
Explanation. When an object is in motion, its surfaces create an interlocking contact, and the object slows down.
(b) Friction depends on the _____________ of surfaces.
Answer. Nature
Explanation. Friction is about the interlocking of the surfaces. If the surface is smooth, then the friction would be less, and if the surface is rough, interlocking would be more, and friction would be more.
(c) Friction produces __________.
Answer. Heat
Explanation. When an object is forced to move against friction, it produces heat.
(d) Sprinkling of powder on the carrom board ________ friction.
Answer. reduces
Explanation. With a powder, the friction reduces as the surface smoothens up.
(e) Sliding friction is ___________ than the static friction.
Answer. lesser
Explanation. Sliding allows less time for interlocking.
