AP Physics 1· difficulty 1/5
Two equal and opposite parallel forces act on a rigid body but their lines of action <strong>don't</strong> coincide. The result is
No motion.
Pure rotation (a couple).
Both translation and rotation.
Pure translation.
Explanation
Equal and opposite forces with different lines of action form a "couple" — net force zero, but nonzero torque → pure rotational acceleration.
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