You\'re sitting in a car that\'s not moving. Also in the car is a helium-filled

Q: You're sitting in a car that's not moving. Also in the car is a helium-filled

b) It floats toward the front of the car. Here we apply buoyant force concept. Air in the car is heavy than the balloon and hence when car moves forward , like any other object in the car this air also moves in the backward direction. However since the balloon has lower density, the air pushes the balloon forward, so hat it will move to the backward. This way balloon moves forward.

ID: 1794910 • Letter: Y

Question

You're sitting in a car that's not moving. Also in the car is a helium-filled balloon, which is resting up against the car's ceiling somewhere near its middle. The driver hits the gas and the car accelerates forward. You're thrown back into your seat.

What happens to the balloon? (Before you answer, think about what will make the balloon act the way you think it will.) Explain why with example or calculation.

a) It floats toward the back of the car.

b) It floats toward the front of the car.

c) It stays put.

Explanation / Answer

b) It floats toward the front of the car.

Here we apply buoyant force concept. Air in the car is heavy than the balloon and hence when car moves forward , like any other object in the car this air also moves in the backward direction. However since the balloon has lower density, the air pushes the balloon forward, so hat it will move to the backward. This way balloon moves forward.

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You\'re sitting in a car that\'s not moving. Also in the car is a helium-filled

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