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### College Physics (Urone)

Book edition 1st Edition
Author(s) Paul Peter Urone
Pages 1272 pages
ISBN 9781938168000

# If you lower the window on a car while moving, an empty plastic bag can sometimes fly out the window. Why does this happen?

The empty plastic bag flies out of the moving car due to pressure difference created when window of car is lowered.

See the step by step solution

## Step 1: Concept of Bernoulli’s principle.

According to the Bernoulli’s principle, the total energy per unit volume of a fluid is constant. The points of the higher fluid speed will be having less pressure than the points of the slower fluids.

## Step 2: Explanation for empty plastic bag flying out of window.

When the window of the moving car is lowered, a pressure difference is created on both the sides of the car. The fluid outside of the car has higher speed with less pressure and the fluid inside the car has low speed with high pressure. So, the empty plastic bag flies away from high pressure inside the car to low pressure outside the car.