Question

please give 10 questions and answers of friction chapter 12 and std 8

Answer 1

$<b >Hey here is your answer$

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Question 1 - You might have noticed that when used for a long time, slippers with rubber soles
become slippery. Explain the reason.


Ans: The rubber soles of new slippers are treaded to increase the friction. When slippers
have been used for a long time, the treads wear off and the surface of the soles become
smooth. As a result, the friction between the rubber soles and the floor decreases and
the slippers become slippery.


Explanation: Friction depends on the nature of surfaces in contact and for a given pair of
surfaces, it depends on the roughness/smoothness of the two surfaces.


Question -2 - . Is there a force of friction between the wheels of a moving train and iron rails? If yes, name the type of friction. If an air cushion can be introduced between the wheel
and the rail, what effect will it have on the friction?

Ans: Yes, the force of friction between the wheels of a moving train and iron rails is rolling
friction. If an air cushion is introduced between the wheels and the rails, the friction
between the two surfaces will decrease.

Question no -3 - Cartilage is present in the joints of our body, which helps in their smooth
movement. With advancing age, this cartilage wears off. How would this affect the
movement of joints?


Ans: The wearing off of cartilage will increase the friction between the joints of our body. As
a result, the movement of joints will become difficult with advancing age. It may also lead to
joint pains.

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hope this helps you

### BE BRAINLY ###

Answer 2

Answer:

ok

Explanation:

SOLUTION

BRAINLIEST

BUDDY