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Kilonewton [kN]


The kilonewton (kN) is a unit of force in the International System of Units (SI).



  • 1 kilonewton equals 1,000 newtons:



1 kN=1,000 N1 \text{ kN} = 1,000 \text{ N}

  • It represents the force required to accelerate a 1,000 kg mass at 1 meter per second squared.



  • Kilonewtons are commonly used to measure larger forces in engineering, construction, and physics, such as the load on structures, thrust in engines, or tension in cables.



Example: The force exerted by a 100 kg mass under Earth's gravity is approximately 0.98 kN.


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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