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Chapter 1: Q24DQ (page 390)

A helium filled balloon is tied to a light string inside a car at rest. The other end of the string is attached to the floor of the car, so the balloon pulls the string vertical. The car now accelerates forward. Does the balloon move? If so, does it move forward or backward? Justify your reasoning with references to buoyancy (if you have a chance, try this experiment yourself but with someone else driving !).

Short Answer

Expert verified

The balloon will move in the forward direction.

Step by step solution

01

Given

a) A helium filled balloon is tied to light string inside a car at rest.

b) The car accelerates in the forward direction.

02

Principles and ideas

Newton's second law of motion, in contrast to the first rule of motion, is concerned with the behavior of bodies when all of the forces acting on them are out of balance. When it comes to forcing conditions, the second rule of motion is much more quantitative and therefore is employed extensively to determine what would happen.

03

Information that is required

To find the movement of the balloon when the car accelerates forward.

04

Explanation

When the automobile speeds, the air will be driven to the rear of the vehicle due to its density being greater than that of the balloon. The balloon then will travel forward in relation to other fixed things in the automobile, in the same way, that a balloon would rise in the air outside of the car is released. Outside the automobile, the air pressure rises with depth, while within the speeding car, the air pressure increases not only in-depth but also with distance from the front of the vehicle.

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