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Kilopound-Force [kipf]


The kilopound-force (kipf) is a unit of force commonly used in engineering, especially in the United States.



  • It equals 1,000 pound-force (lbf).



  • Mathematically:



1 kipf=1,000 lbf4,448.22 newtons1 \text{ kipf} = 1,000 \text{ lbf} \approx 4,448.22 \text{ newtons}

  • The kipf is often used to express large forces such as structural loads, stresses in materials, or foundation pressures.



  • It simplifies large force values by grouping them in thousands of pounds-force, making calculations and communication more convenient.




Pound Foot per Square Second [lbf·ft/s²]


This unit represents a torque or moment of force per unit time squared (though it’s an uncommon combination and can sometimes be context-specific).



  • It combines pound-force (lbf), a unit of force, with foot (ft), a unit of length, divided by second squared (s²), a unit of time squared.



  • It may be used in dynamics or rotational mechanics when dealing with angular accelerations or rate changes of torque.



  • In basic terms:



1 lbf\cdotpft/s2=force×distance÷time21 \text{ lbf·ft/s}^2 = \text{force} \times \text{distance} \div \text{time}^2

  • Since 1 lbf ≈ 4.44822 newtons and 1 ft ≈ 0.3048 meters, this can be converted into SI units as:



1 lbf\cdotpft/s21.35582 N\cdotpm/s21 \text{ lbf·ft/s}^2 \approx 1.35582 \text{ N·m/s}^2

  • Note: This unit is not commonly standard; usage depends on the specific physical context, like rotational dynamics.





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