Net force on a car rounding a curve
A car rounds a flat, circular curve at constant speed. What is the direction of the net force on the car?
Answer C: explanation for every choice
A
A forward net force would increase the car's speed.
B
“Centrifugal” force is an apparent effect in the car's frame, not a real outward force.
C
Correct. Changing direction requires a centripetal force, provided here by static friction between the tires and road.
D
Velocity's direction is changing, so the car is accelerating and the net force isn't zero.
TakeawayConstant speed in a circle still requires a net force toward the center.
Equation usedCentripetal acceleration and force
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