In a news article, it is stated that a recently developed geared turbofan engine produces 15,000 pounds of thrust to propel the aircraft forward. Is “pound” mentioned here lbm or lbf? Explain.

ch 1-9: In a news article, it is stated that a recently developed geared turbofan engine produces 15,000 pounds of thrust to propel the aircraft forward. Is “pound” mentioned here lbm or lbf? Explain.

 

Answer: pound force (lbf) is the force unit whereas pound-mass (lbm) is the mass unit in the english system. one pound force is the force required to accelerate mass of 32.174 lbm by 1 ft/s^2.

the pound mentioned here is (lbf) because of geared turbofan engine produces 15000 pounds of thrust (force) to propel the aircraft to move forward (aaccelerate).

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