VIDEOS 1 TO 50

POUND MASS vs. POUND FORCE (lbm vs. lbf)

Published: 2014/04/07

Channel: Simply Engineering

Pound Force to Pound Mass Conversion : Physics & Math

Published: 2013/10/06

Channel: eHowEducation

Pound Mass versus Pound Force

Published: 2015/01/28

Channel: APMonitor.com

Pound Force, Kilogram Force and Gravitational Constant - Applied Fluid Dynamics - Class 006

Published: 2015/09/24

Channel: Chemical Engineering Guy

How Much Force to Rupture a Spleen: Sport Science

Published: 2014/07/15

Channel: Your Discovery Science

Pound-force (lbf) vs Pound-mass (lbm) vs Slugs

Published: 2014/11/09

Channel: Boom of Prejudice

World's Heaviest Weight

Published: 2017/05/24

Channel: Veritasium

How to Convert Newton Meters to Pound Force Feet : Conversions & Other Math Tips

Published: 2013/01/09

Channel: eHowEducation

2000 pound force

Published: 2017/07/29

Channel: dats fomino

Explaining mass and force units

Published: 2014/01/27

Channel: Brittany Minnich

75 pound Force compound bow

Published: 2016/08/05

Channel: Hank Williams

Alan Duncan Pound Force

Published: 2011/07/06

Channel: Don't Panic London

Apply Force Units

Published: 2014/08/10

Channel: Donald Elger

Pound-force Meaning

Published: 2015/04/20

Channel: SDictionary

Know Huntsville - Foot Pound Force - Bacon Machine

Published: 2015/04/28

Channel: Know Huntsville

Fight Science ( Martial Arts of Kicks )

Published: 2014/08/16

Channel: ต้นไม้เล่าเรื่อง - TreeTalk

POUND FORCE - ALAN DUNCAN MP GETS A NEW GARDEN FEATURE

Published: 2009/05/14

Channel: dontpanicmedia

Know Huntsville - Foot Pound Force

Published: 2015/04/20

Channel: Know Huntsville

What`s a "psi"?

Published: 2014/07/21

Channel: apprenticemath

How To : Convert Inch-lbs & Foot-lbs

Published: 2014/04/08

Channel: Real Tool Reviews

How Much Force Does It Take To Break A Bone?

Published: 2016/10/20

Channel: Seeker

Frank Stea's punch inflicts 1,394lbs of force. Undeniable PROOF!!!!!

Published: 2011/04/23

Channel: Frank Stea

Resolve the 30-lb force into components along the u and v axes

Published: 2016/10/09

Channel: FinalAnswer

That punch tho👊💪 344 pounds of force

Published: 2016/01/08

Channel: Mohammed Ahmar

Foot Pound Force - Bacon Machine

Published: 2013/09/02

Channel: Dragoncon FilkTrack

Pound (force)

Published: 2014/09/30

Channel: Audiopedia

Airforce Texan 730 foot pound , 4500 psi Upgrade from www.africanairordnance.com part 2

Published: 2016/11/26

Channel: Jeremy King

David Hewitt (Foot Pound Force) answers "What is Filk?"

Published: 2014/05/24

Channel: Dragoncon FilkTrack

DragonForce - Operation Ground And Pound [OFFICIAL VIDEO]

Published: 2006/08/18

Channel: Roadrunner Records

Pound (force)

Published: 2016/01/29

Channel: WikiAudio

Foot-pound Force - Zombie Prostitute

Published: 2015/04/05

Channel: H. Kyoht Luterman

Tizzy Stackz - Zoomin (ft. LB)

Published: 2017/07/01

Channel: 24MG

Related lbm to lbf on earth

Published: 2014/08/11

Channel: Donald Elger

Converting Force Pounds to Foot Pound of Max Torque

Published: 2016/02/09

Channel: Crown Oilfield Instrumentation

Foot-pound (energy)

Published: 2016/01/22

Channel: WikiAudio

How to Convert the Torque From Foot-Pounds : Science & Math

Published: 2013/10/05

Channel: eHowEducation

How to Convert Inch-Pounds to Newton-Meters : Conversions & Other Math Tips

Published: 2013/01/20

Channel: eHowEducation

Minn Kota Endura c2 55 lb thrust on 14 ft v-hull

Published: 2013/06/04

Channel: BassQuatchin Pa

Foot-pound Force - I'm Going To Try Science

Published: 2015/04/05

Channel: H. Kyoht Luterman

Pounds per square inch

Published: 2014/08/30

Channel: Audiopedia

Foot-pound Force - Little Red Button

Published: 2015/04/05

Channel: H. Kyoht Luterman

Steel Bender's Helper™ Ratings: Pounds of Force Required to Bend Them

Published: 2017/05/23

Channel: Primal Punch

Foot-pound Force - Craft Beer Nerds

Published: 2015/04/05

Channel: H. Kyoht Luterman

Ivy - One-Pound Force of Life - Sight-Impaired CH Kitten

Published: 2012/10/15

Channel: Jennifer McCollum

HolliStar V2 Rocket Engine Tests 50 pounds of force

Published: 2014/09/24

Channel: Jared Brewer

My New Magnet Fishing Magnet 500 LB Holding Force Will It Lift A 315 LB Man?

Published: 2017/02/06

Channel: Jiggs Outdoors

How to use a Torque Wrench

Published: 2016/07/22

Channel: Mark's Garage

Converting Feet to PSI

Published: 2015/12/14

Channel: FranklinWater

Dirtbike LB ft Young Adz - Bragging Rights @DIRTBIKE_LB @YoungAdz1

Published: 2017/02/11

Channel: RayleighSho

How to read and set a torque wrench (ft-lb and Nm)

Published: 2012/09/29

Channel: apprenticemath

(Redirected from Pound-force)

Look up or pound-force in Wiktionary, the free dictionary.pound |

Pound-force | |
---|---|

Unit system | English Engineering units, British Gravitational System |

Symbol | lbf |

Unit conversions | |

1 lbf in ... |
... is equal to ... |

SI units | 4.448222 N |

CGS units | 444,822.2 dyn |

Absolute English System | 32.17405 pdl |

The **pound-force** (symbol: **lbf**^{[1]}, sometimes **lb _{f}**,

The pound-force is equal to the gravitational force exerted on a mass of one avoirdupois pound on the surface of Earth. Since the 18th century, the unit has been used in low-precision measurements, for which small changes in Earth's gravity (which varies from place to place by up to half a percent) can safely be neglected.^{[4]}

The 20th century, however, brought the need for a more precise definition. A standardized value for acceleration due to gravity was therefore needed. Today, in accordance with the General Conference on Weights and Measures, standard gravity is usually taken to be 9.80665 m/s^{2} (about 32.174 049 ft/s^{2}).^{[5]}^{[6]}

The acceleration of the standard gravitational field (*g*_{n}) and the international avoirdupois pound (lb) define the pound-force as 4.4482216152605 N:^{[7]}

This definition can be rephrased in terms of the slug. A slug has a mass of 32.174049 lb. A pound-force is the amount of force required to accelerate a slug at a rate of 1 ft/s^{2}, so:

1 lb m ∗1 slug/32.2 lb m ∗32.2ft/s^2 =1 lb f

newton (SI unit) |
dyne | kilogram-force, kilopond |
pound-force | poundal | |
---|---|---|---|---|---|

1 N | ≡ 1 kg⋅m/s^{2} |
= 10^{5} dyn |
≈ 0.10197 kp | ≈ 0.22481 lbf | ≈ 7.2330 pdl |

1 dyn | = 10^{−5} N |
≡ 1 g⋅cm/s^{2} |
≈ 1.0197 × 10^{−6} kp |
≈ 2.2481 × 10^{−6} lbf |
≈ 7.2330 × 10^{−5} pdl |

1 kp | = 9.80665 N | = 980665 dyn | ≡ g_{n}⋅(1 kg) |
≈ 2.2046 lbf | ≈ 70.932 pdl |

1 lbf | ≈ 4.448222 N | ≈ 444822 dyn | ≈ 0.45359 kp | ≡ g_{n}⋅(1 lb) |
≈ 32.174 pdl |

1 pdl | ≈ 0.138255 N | ≈ 13825 dyn | ≈ 0.014098 kp | ≈ 0.031081 lbf | ≡ 1 lb⋅ft/s^{2} |

The value of g_{n} as used in the official definition of the kilogram-force is used here for all gravitational units. |

In some contexts, the term "pound" is used almost exclusively to refer to the unit of force and not the unit of mass. In those applications, the preferred unit of mass is the slug, i.e. lbf·s^{2}/ft. In other contexts, the unit "pound" refers to a unit of mass. The international standard symbol for the pound as a unit of mass is lb.^{[8]}

Base units | Force, length, time | Weight, length, time | Mass, length, time | |||||
---|---|---|---|---|---|---|---|---|

2nd Law of Motion | m = F/a |
F = w⋅a/g_{c} |
F = m⋅a |
|||||

System | BG | GM | EE | M | AE | CGS | MTS | SI |

Acceleration (a) |
ft/s^{2} |
m/s^{2} |
ft/s^{2} |
m/s^{2} |
ft/s^{2} |
Gal | m/s^{2} |
m/s^{2} |

Mass (m) |
slug | hyl | lb | kg | lb | g | t | kg |

Force (F),Weight ( w) |
lb | kp | pdl | dyn | sn | N | ||

Pressure (p) |
lb/in^{2} |
at | psi | atm | pdl/ft^{2} |
Ba | pz | Pa |

In the "engineering" systems (middle column), the weight of the mass unit (pound-mass) on Earth's surface is approximately equal to the force unit (pound-force). This is convenient because one pound mass exerts one pound force due to gravity. Note, however, unlike the other systems the force unit is not equal to the mass unit multiplied by the acceleration unit^{[9]}—the use of Newton's Second Law, *F = m·a*, requires another factor, *g _{c}*, usually taken to be 32.174049 lb·ft/lbf·s

- Foot-pound (energy)
- Ton-force
- Kip (unit)
- Mass in general relativity
- Mass in special relativity
- Mass versus weight for the difference between the two physical properties
- Newton
- Poundal
- Pounds per square inch, a unit of pressure

- Obert, Edward F., “THERMODYNAMICS”, D.J. Leggett Book Company Inc., New York 1948; Chapter I, Survey of Dimensions and Units, pages 1-24.

**^**IEEE Standard Letter Symbols for Units of Measurement (SI Units, Customary Inch-Pound Units, and Certain Other Units), IEEE Std 260.1™-2004 (Revision of IEEE Std 260.1-1993)**^**Fletcher, Leroy S.; Shoup, Terry E. (1978),*Introduction to Engineering*, Prentice-Hall, ISBN 978-0135018583, LCCN 77024142.^{:257}**^**"Mass and Weight".*engineeringtoolbox.com*.**^**Acceleration due to gravity varies over the surface of the Earth, generally increasing from about 9.78 m/s^{2}(32.1 ft/s^{2}) at the equator to about 9.83 m/s^{2}(32.3 ft/s^{2}) at the poles.**^**In 1901 the third CGPM declared (second resolution) that:The value adopted in the International Service of Weights and Measures for the standard acceleration due to Earth's gravity is 980.665 cm/s

^{2}, value already stated in the laws of some countries.This value was the conventional reference for calculating the kilogram-force, a unit of force whose use has been deprecated since the introduction of SI.

**^**Barry N. Taylor,*Guide for the Use of the International System of Units (SI)*, 1995, NIST Special Publication 811, Appendix B note 24**^**The international avoirdupois pound is defined to be exactly 0.45359237 kg.**^**IEEE Std 260.1™-2004, IEEE Standard Letter Symbols for Units of Measurement (SI Units, Customary Inch-Pound Units, and Certain Other Units)**^**The acceleration unit is the distance unit divided by the time unit squared.

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