työntövoima
Työntövoima, or thrust, is the force that propels a vehicle in the direction of its motion. In physics and engineering, työntövoima is the reaction force produced when a propulsion system expels mass or accelerates the surrounding fluid. The net forward force depends on propulsion type and operating conditions.
Propulsion mechanisms fall mainly into reaction-based and momentum-based categories. Rocket and jet engines rely on reaction
Thrust is measured in newtons (N). In design practice, a simplified relation is F ≈ ṁ v_e, where
Applications include aircraft, rockets, ships, submarines, and space probes. The concept rests on Newton’s third law