Question

A jet plane is moving at a constant velocity on a flat surface. Select all of the forces that act against the forward motion of the plane.

Select the two forces that act against the forward motion of the plane.

Responses

friction
friction

gravity
gravity

air resistance
air resistance

engine thrust

Answer 1

The two forces that act against the forward motion of the plane are:

1. **Friction**
2. **Air resistance**

Gravity does not act against the forward motion; it acts downward, and engine thrust is the force that propels the plane forward, not against it.