A balloon floats inside a stopped car. When the car starts moving forward, the balloon appears to move backwards relative to the car. Which statement best explains this observation?
1. The car moves forward, while inertia keeps the balloon in place.
2. The force of inertia on the balloon balances the force from the motion of the car.
3. Inertia prevents the force of the car from acting on the balloon.
4. The motion of the car creates an unbalanced backward force on the balloon.
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2. The force of inertia on the balloon balances the force from the motion of the car.
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