Answers

2015-07-05T12:34:41+05:30
Sometimes machines in big factories doesnt work due to friction.
we also get injured due to friction

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2015-07-05T14:19:18+05:30
There are advantages as well as disadvantages of the presence of friction.
Disadvantages:
We get hurt due to this frictional force if fall down or slid or in an accident.
It decreases the efficiency of all the machines,etc.
Advantages;
We can walk or run due to presence of friction between our legs and can drive cycles and vehicles ,etc


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