How does a paper airplane apply Newton's 3 laws?

Answer 1

First law: The speed of the paper airplane remains constant unless acted upon by an external force. At launch, until thrown by someone, the airplane is at rest. In the air, drag (friction) is slowing the aircraft down.

Second law: The airplane's acceleration at every instant is equal to the sum of all the forces on it divided by its mass.

Third law: As the paper airplane's wings generate lift, they are subject to gravity. When thrown, the airplane has thrust, but drag is also generated.