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Which of the following statements is correct about friction?
It opposes motion.
ii. It results in wear and tear.
il. It produces heat.
iv. all of these
d) Name the substance coated on moving parts of machines to reduce friction
on comes into
1. grease
i oil
ined.
ji boric acid
iv. both (i) and (ii)
e) Why does a mixer grinder running continuously for a long period of time feels warm?
i. Friction converts a part of electrical energy into heat.
ii. Friction converts a part of heat energy into electrical energy
in. Mixer-grinder jar is made of low quality material.
iv. Current flowing through the circuit is low.
ther
f)
Why do we slip when the floor is wet?
ther
i. Water increases friction between the floor and our feet.
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11. Water reduces friction between the floor and our feet.
Hi. Water makes the surface of the floor hard.
ect
iv. Water makes the surface of the floor soft.
h
g) Name the force of friction that acts when we try to move an object at rest.
i. sliding friction
ii rolling friction
iii. static friction
iv. none of these
Answers
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Answer:
t.b
Explanation:
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