Drag and Thrust
Drag is a resistive force. Two familiar
- Friction occurs when two objects are in
contact and sliding with respect to each other. In this case, the friction
force equals Ff = μ N, and it
opposite to the direction of motion.
- Air resistance. This arises, for
example, when running into the wind. In this course, we will typically
ignore air resistance.
Thrust is a force that is typically caused
by gas molecules being ejects from an engine at high speeds.