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If you see an object following a curve path, you can safely assume:There is a net force being applied The net force is zero

If you see an object following a curve path, you can safely assume:There is a net-example-1
User BenjaminParker
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If an object is following a curve, it means that it is changing direction. This change in direction will cause a change in velocity. Change in velocity causes acceleration. Since the velocity keeps changing, the acceleration is not zero. This also means that the net force is not zero. Therefore, you can safely assume:

There is a net force being applied

User YKa
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