Write two positive and two negative effects of friction. (4 marks)
Answers
Answer :-
↪ Positive effects of friction :-
Helps us to walk properly on land.
Nails can be fixed in a wall due to friction.
It enables to slow down vehicles without skidding.
It enables us to write with chalk on black board.
↪ Negative effects of friction :-
Friction wears out the soles of shoes.
Causes wear and tear of machines.
Forest fires are caused due to friction due to the heat, friction produced between the branches.
It opposes the motion, so extra energy is required to overcome.
Disadvantages of Friction:-
It results in the production of heat which causes damage to machinery.
It causes wear and tear of parts of machinery in contact. Thus their life time reduces.
Extra energy is spent to overcome friction which leads to unnecessary expense of energy.
Advantages of Friction;-
Friction is responsible for many types of motionIt helps us walk on the ground
Brakes in a car make use of friction to stop the car...
Asteroids are burnt in the atmosphere before reaching Earth due to friction.
Hope this helps you.....
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