There are two meanings listed in OED''s entry for the noun foot-pound. See ‘Meaning & use’ for definitions, usage, and quotation evidence.
This word is used in U.S. English.
The earliest known use of the noun foot-pound is in the 1840s.
OED''s earliest evidence for foot-pound is from 1847, in a translation by J. R. and L. D. B. Gordon.
foot-pound is formed within English, by compounding.
Etymons: foot n., pound n.1
Originally published as part of the entry for foot, n. & int.
foot, n. & int. was revised in March 2016.
oed is a living text, updated every three months. Modifications may include:
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Home » Physics » Defenition » What is a foot lb of energy?
The foot-pound force (symbol: ft⋅lbf, ft⋅lbf, or ft⋅lb) is a unit of work or energy in the engineering and gravitational systems in United States customary and imperial units of measure. It is the energy transferred upon applying a force of one pound-force (lbf) through a linear displacement of one foot.
As a unit of energy, one foot-pound is the energy it takes to push with one pound-force one pound for a distance of one foot. 1 foot-pound is equivalent to: 1.3558179483314004 joules (exactly) 13558179.483314004 ergs (exactly)
Pounds or Pounds Force per Square Foot is a British (Imperial) and American pressure unit which is directly related to the psi pressure unit by a factor of 144 (1 sq ft = 12 in x 12 in = 144 sq in). 1 pound per square foot equals 47.8803 pascals.
So, first thing first: torque is a measure of force. It’s measured in pound-feet (lb-ft). So, one pound acting on a lever one foot away from an axle will be one lb-ft of torque.
The “pound-foot” (lb-ft) is a unit of torque and a vector measurement that is created by one pound of force acting on a one foot lever. The formula for torque in the instance of tightening a fastener would be: Torque equals force times radius, or T = FR.
Pound-foot is a unit of torque and a vector measurement created by one pound of force acting on a one-foot lever, EngineLabs explains. You’ll see the plural form of the term, “pound-feet,” abbreviated in car performance specs, such as 250 lb-ft of torque. However, foot-pound is “a measurement of work,” EngineLabs adds.
One foot-pound is equal to 12 inch-pounds. To convert your foot-pound measurement to inch-pounds, multiply your figure by 12.
To begin with, the definition of “foot-pounds” is: “a unit of energy, equal to the amount of energy required to raise a weight of one pound a distance of one foot.” (Webster’s) Anyone who has ever played around with firearms for very long has discovered that a gun with “2000 ft.
We measure torque by multiplying two factors—amount of force applied and distance from the point of application. For this reason, the torque amount is written in units of force and distance, like 15 lbf. ft torque measurements in ounces and inches will be smaller than those in feet and pounds or yards and tons.
In SI units, pressure is measured in pascals; one pascal equals one newton per square metre. Atmospheric pressure is close to 100,000 pascals.
The pound of force or pound-force (symbol: lbf, sometimes lbf,) is a unit of force used in some systems of measurement, including English Engineering units and the foot–pound–second system.
The number 5,252 is the result of lumping several different conversion factors together into one number. First, 1 horsepower is defined as 550 foot-pounds per second (read How Horsepower Works to find out how they got that number). The units of torque are pound-feet.
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