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Question

The air exerts a forward force of 10 N on a propeller of a .20kg model airplane. If the plane accelerates forward at 2.0 m/s2, What is the magnitude of the restistive force excerted by the air on the plane?

P.S. Dont get me wrong....I dont want the answer i just need help....Im a Jr. in high school taking College Physics and i miss one class a week so i get behind...please help
*thanks*

Answer 1

F(net) = m x a

F (net) = F (forward) - F(air friction)

so F(air friction) = F (net) - F(forward)

Mass is given 20 kg

net acceleration given 2.0 m/s^2


Solve for the Net Force, subtract the forward force, the difference is the force due to air friction.