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  • mechanical engineering - Pound-force (lbf) vs Pound-mass (lbm . . .
    The following relationship is key to understand the link between lbm and lbf: 1 lbf=32 174 lbm ft s^2 Arm yourself with this knowledge so that you can fight the good fight: the next time you hear someone say that pound-mass and pound-force are the same thing, you can confidently say they are not!
  • What is difference between in-lb and inch-lbf? - Physics Forums
    The discussion revolves around the confusion between the torque units inch-lb and inch-lbf, exploring their definitions and usage in practical contexts One participant, Ram18, equates inch-lb and inch-lbf and expresses a need for a torque of 2500000 inch-lbf
  • What Do Lbf, Lb, and Lbm Really Mean in American Units?
    The discussion revolves around the meanings and relationships between the units lbf (pound-force), lbm (pound-mass), and lb (pound) within the American system of measurement Participants explore questions regarding the definitions, conversions, and applications of these units in various contexts, including physics and engineering Some participants question whether lbf is a force and lbm is a
  • Reconcile poundforce w slug and lbmass • Physics Forums
    Chestermiller said: 1 lbf is the force needed to give a mass of 1 lbm an acceleration of 32 2 ft sec^2 What if you're near the equator where the free fall acceleration is less than 32 1 ft s 2? If you set an object with a mass of one pound on a spring scale, don't you want it to exert one pound of force on the scale?
  • Why is 1 lbm considered equal 1 lbf? - Physics Forums
    My understanding is that 1lbm = l lbf 32 174 ft s^2 = 3 1081*10^-2 (lb*s^2) ft (slug) My textbook suddenly claims that 1 lbf is equal to 1 lbm This doesn't fundamentally make sense to me because one unit is mass and the other is force (which has an acceleration constant) Thanks for helping
  • Unit conversion:lbm lbf*h to (N s) N - Physics Forums
    The discussion revolves around converting thrust-specific fuel consumption from imperial units (lb lbf*h) to SI units ( (N s) N) The original poster attempts to perform the conversion but encounters difficulties with unit cancellation and dimensional consistency Participants explore various unit conversion methods, questioning the placement of units in the numerator and denominator Some
  • Is Our Weight Measured in lbm or lbf? - Physics Forums
    The discussion centers around the measurement of weight, specifically whether it is expressed in pound-mass (lbm) or pound-force (lbf) Participants explore the implications of weight measurement in different gravitational contexts, such as on Earth versus the Moon, and the terminology used in everyday language versus scientific definitions
  • Converting lbm lbf: Help with Newtons 2nd Law - Physics Forums
    The discussion revolves around the conversion between mass pounds (lbm) and force pounds (lbf) in the context of applying Newton's second law to calculate mass flow rate
  • Pounds is a unit of mass or weight - Physics Forums
    The pound unit gets confusing, as there are several definitions related to separate terms like lbf, lbm, poundals, etc For most physics problems using Newton's laws, pound is defined as unit of force, used primarily in the USA In the SI system, the force unit is the Newton 1 kg weighs 9 8 Newtons, or 2 2 pounds, more or less That's a conversion factor used to equate mass with weight on
  • Understanding the English Engineering System: Lbm and Lbf Conversion
    The original poster attempts to clarify the conversion process between lbm and lbf, questioning the role of gravitational constants Other participants provide insights into the distinction between mass and weight in the English system, highlighting the importance of using consistent units





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