The air exerts a forward force of 10 N on the propeller of a .20-kg model airplane. If the plane accelerates forward at 2.0 m/s^2, what is the magnitude of the resistive force exerted by the air on the airplane?
1 Answer
Nov 24, 2015
9.6N
Explanation:
Using newtons second law
Fnet=ma
What is the net force of the plane? It is primarily forward but encounters some air resistance. So first, draw your free body diagram.
http://www.funpaperairplanes.com/learn_about_flight.html
In our case, the magnitude of the thrust force is greater than the drag, so our Net force would be Thrust - Drag.
Note* For convenience, I will use Fd as drag force and P as thrust force.
Fnet=ma