A car moving at constant velocity of 10 m/s has net force acting on it equal to
A. Frictional force
B. Weight of car
C. Force of engine
D. Zero
Answer: Option D
Solution (By JKSSB Mock Tests)
Constant velocity implies zero acceleration, net force = 0 by Newton's first law. Engine force balances friction and air resistance. Net force zero, not necessarily zero forces.
Explanation:
Centripetal force acts towards centre, necessary for circular motion. Centrifugal is pseudo-force in rotating frame. In uniform circular motion, centripetal force = mv²/r.
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