Asked by Cory

A 710 kg car travels along US-321. How much working is needed to keep the car traveling at a constant speed of 21.1 m/s around a curve of radius 28.2 m?
Answered by bobpursley
None. Think out why, and post, we will be happy to critique your thinking. This is akin to asking how much work is needed to keep a satellite in orbit.
Answered by Cory
Because work=force*distance. The net force is zero for a car traveling along a level road at constant velocity. The zero total work explains why the car’s speed doesn’t change.
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