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  • Defn: mass vs. weight kg vs. lbs - Physics Forums
    We use metric and imperial measurements interchangably (I weigh 82kg or 180 lbs, same diff) but they are not at their essense the same thing Pounds measure weight - our weight here on Earth (an effect of the gravitational pull of the Earth), whereas kilograms are intended to measure mass (a property of the number of atoms in the sample
  • Pounds is a unit of mass or weight - Physics Forums
    In gravitational terms, the slug is the FPS unit of mass, the lb f[ sub} is the FPS unit of force, the kg f is the MKS unit of force, and the kg-sec² m is the MKS unit of mass Commonly in the US, you will compare lb to kg (1 kg = 2 2lb for instance) and the kg is considered a unit of mass
  • Mass vs Mass as a Force (Weight) - Physics Forums
    The imperial system uses lbs to describe two types of units, lbs mass and lbs force 1lb force is the force exerted by gravity on 1 lb mass Unfortunately, the lb mass is not the correct unit to use in applying Newton's 2nd law, so that, F is not equal to ma, if m is in lbs mass and F is in lbs force
  • Why can lbs be considered a mass and a force? - Physics Forums
    O K , you can put a bag over your head and redirect to NIST, but consider that the word "pound" derives from the Roman libra unit, which obviously long predates Newton, F=ma, and the concept of mass as opposed to weight, which is a force Or consider that your torque wrench is written in ft-lbs, not ft-lbs-force Or not
  • Grams vs. Newtons: Why Do I See Weights Measured in Grams? - Physics Forums
    This is an alright thing to do, since for all common purposes, any weight will be measured at the same strength of the gravitational field So weighing a mass of e g 5 kg will always nett 49 05 N I e , seeing a 5 kg dumbbell you know it always weighs 'as much as a 5 kg mass'
  • How Do I Convert Pounds to Kilograms? - Physics Forums
    A pound being a measure of weight (force)and a kg being a measure of mass - how would I convert lbs to Kg? If F=ma, Kg would be on the right of the equation and Lb on the left which I don't think is equal since a lb takes into consideration the acceleration of gravity and the Kg does not I can't seem to put together the acceleration part
  • Understanding Mass vs Weight - Can I State My Weight in Newtons?
    Understanding Newtons vs Joules - Beginner Def'n: mass vs weight kg vs lbs Mar 2, 2007; Replies 27
  • Comparing Force and Power of Punch vs Bullet - Physics Forums
    "We can calculate the energy of the blow using the kinetic energy = 1 2 mv^2 calculation The mass of the fist plus forearm is 2-4 kg, so the total energy is in the range 100-450 Joules, or 70-330 foot-lbs " That statement is just plain dumb as a person doesn't just make their arm move then go totally limp as they make contact
  • What Do Lbf, Lb, and Lbm Really Mean in American Units? - Physics Forums
    As such, 1 lbf = 0 453 592 37 kg * 9 80665 m s 2 = 4 44822162 N There is also a unit of mass called the slug, defined as the mass which exerts a force of 32 174 049 lbs under the gravitational acceleration at the Earth's surface
  • What is the correct way to calculate the power required to lift a mass?
    5 watts over 1 second is 5 watt seconds or 5 Joules change in 1 second Or in power terms, 550 lbs will be lifted 1 foot, in 1 second for 1 hp that 5 watt motor is 07 HP that's 38lbs 1ft in 1 second now, if you want to lift a huge weight like 38,000lbs, you would be able to move it 1 1000 of a foot in 1 second





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