Which of the following would not have been possible if there was no friction?

Fixing a nail on the wall

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Starting and stopping of vehicles

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Tying a knot

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All of these

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Solution

The correct option is D
All of these

If the friction does not exist, then the nail cannot be fixed on the wall. When the nail is drilled into the wall, it shoves away the material of the wall and this applies pressure against the nail. If there was no friction, we cannot make a car start or stop or turn its direction. A knot can be tied only because of the existence of friction as otherwise, the knot wouldn't be in place.

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