What´s mean lbf?

Question

For example : ENGINE THRUST 15,000 lbf ( whats mean ibf)

Answer 1

The engine thrust of 15000 lbf means that the engine produces 15000 pounds of force (thrust). This is just another unit of force measurment.



Pounds-force can be directly converted to any other measure of force such as Newtons or Dynes. (1 lbf= 4.44822 Newtons)



Torque would be pounds-force multiplied by a distance (usually in feet). Example: 15000 lbf applied to a 10 foot moment arm (lever) would produce 150000 lbs*ft of torque. Torque is a measurement of rotational force.



Engine thrust described this way is a direct force, not torque. Don't confuse the two.

Answer 2

Lbf Units

Answer 3

An object with a mass of one pound has a weight of one pound (lb) at the Earth's surface. But that weight is actually a force, so to remove the confusion between mass and weight we say that the gravitational force on an object of mass one pound is one pound-force, or lbf.



Think of your 15,000-lbf engine thrusting upwards. To balance its thrust, assuming it is at the Earth's surface, you would have to attach 15,000lb of mass, which would exert a force of 15,000 lbf downwards. That's all it means.

Answer 4

for a non-physics point of view, they are the same. You weigh 160 lb period. For a physicist (who would not be using either term, they would use newtons or kg), you weigh 160 lbf and your mass is therefore 160 lbm if you are on the surface of earth.

Answer 5

RE:

What´s mean lbf?

For example : ENGINE THRUST 15,000 lbf ( whats mean ibf)

Answer 6

As mentioned above lbf is pound-force.



lbf is to Newtons as lbm is to kg.



lbm is also sometimes referred to as slugs. The conversion between lbm (slugs) and lbf would require using the g=33.2 ft/s^2.



i.e. lbf divided by 32.2ft/s^2 = mass in slugs (or lbm)

Answer 7

As mentioned above... but it's not "ibf" it's "Lbf"



lbf is pounds-force. It's the English unit of Force.



lbf (pounds-force) is to N (newtons) as lbm (pounds-mass) is to Kg (kilograms)

Answer 8

Lbf is pound force, as opposed to lbm which is pound mass.

Answer 9

in engine thrust, 15,000 lbf would most likely be foot pounds of torque. The power it takes to drive the what ever the motor is driving. Which can also be calculated in HP(Horse Power).