write the disadvantages of friction
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Three disadvantages of friction are :
Friction produces heat which damages the moving parts of a machine.
Friction produces wear and tear on the contacting surfaces. This reduces the life of machine parts, tyres and shoe soles.
A lot of energy is wasted in overcoming the friction before an object starts moving.
Explanation:
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It always resists the motion, so extra energy is required to overcome it.
It causes wear and tear of machines.
It decreases the life expectancy of moving parts of vehicles.
Since friction is very useful in some cases while harmful in some cases, friction is called a necessary evil.
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