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Teaching What is ‘zero gravity’ that people experience in the vomit comet or space flight?

What is ‘zero gravity’ that people experience in the vomit comet or space flight?

In the zero-gravity airplanes or vomit comet, why does stuff behave like there is no gravity when it is just falling? – Austin B., 11, Scranton, Pennsylvania

Steven Collicott, Professor of Aeronautics and Astronautics, Purdue University
The Conversation

ESSENTIAL QUESTION:

How can you achieve "zero gravity"?
STANDARDS:

DEPTH OF KNOWLEDGE (DOK) LEVELS:

2,3
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