Forces in action
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11. Misconceptions


If an object is moving, there must be some force making it move. Wrong! It could be moving without accelerating.

• If v = 0, then Fnet must be zero. Wrong! Think of a projectile shot straight up at its peak.

• An object must move in the direction of the net force. Wrong! It must accelerate that way but not necessarily move that way.

• Heavy objects must fall faster than light ones. Wrong! The rate is the same in a vacuum.

• If an object accelerates, its speed must change. Wrong! It could be turning at constant speed.

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