Engine thrust is the force produced by an engine to propel an object, such as an aircraft or a rocket, forward. This force is generated by expelling mass in the opposite direction, following Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. In aviation, jet engines and propellers are common sources of thrust. Jet engines work by sucking in air, compressing it, mixing it with fuel, and igniting the mixture to produce high-speed exhaust gases. Propellers, on the other hand, create thrust by rotating blades that push air backward, resulting in forward motion.