Foot-Pound : The foot-pound (symbol: ft•lb) is a measurement unit of energy which is equivalent to 1.3558179483314 joules. It is defined as the amount of energy expended in applying a force of one pound-force through a displacement of one foot. Commonly used in the Engineering and Gravitational Systems in United States customary and imperial units of measure. In additional, the foot-pound is also used as a unit of torque.Although calling the torque unit “pound-foot” has been academically suggested, both are still commonly called “foot-pound” in colloquial usage. To avoid confusion, it is not uncommon for people to specify each as “foot-pound of energy” or “foot-pound of torque” respectively.

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Both inch-pounds and foot-pounds are also units of work or energy, as they measure the amount of force required to move an object a certain distance around a fixed axis. These units are commonly used in engineering, physics, and mechanics to measure the energy required to rotate or move objects.

Torque is the amount of force required to rotate an object by a certain distance. Since it is force multiplied by distance, torque can also be interpreted as a unit of work or energy.

So while both measurements have a force component (pounds) and what is called a displacement component (feet), one is a scalar and one is a vector – which is a fancy way of saying they measure different things.Pollak continues, “You can think of a revolution as a measurement of an angle. One revolution is 360 degrees of a circle. Since the circumference of a circle is (2 times pi times radius), there are 2-pi radians in a revolution. To convert revolutions per minute to radians per second, you multiply RPM by (2-pi/60), which equals 0.10472 radians per second. This gives us the ‘per second’ we need to calculate horsepower.”So there you have it: a professional automotive engineer’s explanation on how horsepower can be defined in foot-pounds, but its major component – torque – is measured in pound-feet. The magic for the unit conversions all occurs in how we get that “5,252” number, and you can also see the difficulty with which the units of measure are converted from one to the other.To get from pound-feet of torque to horsepower, you need to go through a few conversions. The number 5,252 is the result of lumping several different conversion factors together into one number. – Gary W. Pollak, P.E., SAE

The industry standard for measuring an engine’s power output is SAE Standard J1349, which is the standard adopted by SAE to specify a basis for net engine power and torque ratings. “SAE standard J1349, Table 1 lists the units of measure used in the standard as “N-m or lb-ft” for torque and “kW or hp” for the horsepower ratings,” says Gary W. Pollak, P.E., Program Manager for the Society of Automotive Engineers.

“To get from pound-feet of torque to horsepower, you need to go through a few conversions. The number 5,252 is the result of lumping several different conversion factors together into one number,” explains Pollak. “Engine speed is normally referred to in revolutions per minute. Since we want a ‘per second,’ we need to convert RPM to ‘something per second’. The seconds are easy – we just divide by 60 to get from minutes to seconds. Now what we need is a dimensionless unit for revolutions: a radian. A radian is actually a ratio of the length of an arc divided by the length of a radius, so the units of length cancel out and you’re left with a dimensionless measure.”As you’ve seen, the maximum healthy weight loss pace is up to 2 pounds per week, while your first inch needs about 8 pounds loss. So, it is possible to lose an inch in four weeks.