Which statement best defines thrust as the force that imparts a change in velocity of a mass and has no element of time?

• A. Thrust Aerodynamic Force
• B. Thrust
• C. Torquemeter
• D. Time And Speed Table

Answer: (B)

Thrust is the force that acts on a mass to change its velocity. In aviation, it’s the propulsion force produced by the engine or propeller that pushes the aircraft forward, causing acceleration in the direction of the thrust. The term thrust itself is a force; the idea of a velocity change involves acceleration (change in velocity over time), and impulse (force times time) is what changes momentum. So thrust is defined as the force, not a quantity that already includes time. The other options aren’t defining thrust: a torquemeter measures torque, and a time-and-speed table is just a chart, not a propulsion force.