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4. Which among the following is not always a disadvantage of friction?
(a) Friction heats up parts of machines.
(b) Friction produces wear and tear.
(c) Friction decreases the speed of a moving body.
(d) Friction makes movement difficult.
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Answer :

GinnyAnswer

Final answer:

Friction is essential for various functions despite its disadvantages.


Explanation:

Friction is a force that resists movement between two surfaces sliding against each other. It can generate heat, wear and tear, and make movement difficult. However, friction is not always a disadvantage as it plays a crucial role in enabling us to walk, preventing slipping, and aiding in stopping vehicles from skidding.


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