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Friction

Why does a dr...

Question

Why does a driver increase the speed or velocity of his car on approaching a hilly road?

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Solution

When a vehicle travels on a flat road, it must exert effort to overcome road friction and air resistance, but no effort is exerted against the force of gravity.
When a vehicle is traveling up a hill, however, it must struggle against gravity in addition to friction and air resistance.
Hence, when approaching a mountainous road, drivers increase their car speed.

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