Question

Udentify the situations were friction is beneficial and non beneficial and make it as a table
-Wearing out of the tyres
-Knives are sharpened by rubbing on stone
-Wearing out of brakes of vehicles
-Ability to walk on the floor
-Treading of tyres of vehicles
-Strike a matchstick on the side of the matchstick
-Ability to hold objects
-When playing guitar and the sliding hand is very sore because of friction
-Wear and tear of machines


Please answer​

Answer 1

Answer:

Two students are discussing the given ray diagram. Choose who among the two is correct.

Light source

Light rays

Object

Ravi: Objects always releases only three rays of light as we can see in the given diagram

Mukesh: No, objects release a lot of rays of light but for our convenience we only show few of them

please mark me as brainliest answer please

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