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Acceleration occurs whenever an ___________________ force acts on an object.

User Pshx
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Acceleration is known to occur whenever an unbalanced force acts on an object.
User Ossys
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Acceleration occurs whenever the forces on an object are unbalanced.

It's the group of forces on the object that's either balanced or unbalanced.
There's no such thing as "an unbalanced force".

User YaTaras
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