Which situations contain unbalanced forces? Check all that apply.A book rests on a table.A book falls to the floor.A car skids to a stop.A duck floats on a pond.A balloon hangs in midair.A foam ball launches from a spring.

Unbalanced forces cause an object’s motion to change. A book falling and a foam ball launching from a spring accelerate, while a car skidding to a stop slows down, so each has unbalanced forces. The resting book, floating duck, and hanging balloon are not changing their motion, so their forces are balanced.

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