How strong is 1 newton(N)? How does it convert to kgf?
1 newton (N) is the SI base unit of force, defined as the force needed to accelerate 1kg mass at 1m/s² (F=ma). Intuitively: holding a ~100g apple requires about 1N of force. 1kgf is the weight of 1kg mass under standard gravity: 1kgf=gₙ×1kg=9.80665N. For quick mental math 1kgf≈10N is often used, but use 9.80665 for precise calculations.
How many newtons are in 1 pound-force(lbf)?
1lbf=4.4482216152605N (precise, based on standard gravity and international pound definition). Rough estimate: 1lbf≈4.45N, 1N≈0.225lbf. lbf (pound-force) is commonly used in US/UK engineering while SI uses N. You'll encounter lbf in export product design, US-standard drawings, and imported equipment manuals.
How do kN and ton-force(tf) convert? Common in structural engineering
In structural engineering, loads are commonly expressed in kN (kilonewtons), while field workers often use ton-force for intuitive understanding. 1kN=1000N, 1tf (tonne-force)=1000kgf=9.80665kN. Rough conversion: 1tf≈10kN, 1kN≈0.1tf. Example: floor design load 2kN/m²≈200kgf/m² (~200kg per square meter load capacity). Building design per ASCE 7 uses kN as standard.
What is a dyne(dyn)? Is it still used?
The dyne (dyn) is the CGS (centimeter-gram-second) unit of force: 1dyn=10⁻⁵N=0.00001N (i.e., 1g·cm/s²). A dyne is very small—about the force to lift 1 milligram. Modern engineering and science have largely replaced dyn with SI newtons, but you still see it in older literature, surface tension (often dyn/cm), physics experiments, and astrophysics papers.
What's the difference between poundal(pdl) and pound-force(lbf)?
Both are imperial force units but defined differently: pdl (poundal) is an absolute unit like SI's N—the force to accelerate 1lb mass at 1ft/s², 1pdl≈0.138N; lbf (pound-force) is a gravitational unit like kgf—the weight of 1lb under standard gravity, 1lbf≈4.448N. Relationship: 1lbf=32.174pdl (g=32.174ft/s²). pdl is rarely used in modern engineering, found occasionally in old US textbooks.
Is kilogram-force(kgf) the same as kilogram?
Physically no, but colloquially they're mixed. Kilogram (kg) is mass—doesn't change with location; kgf (kilogram-force) is force—the gravitational force on 1kg at Earth's surface. The same object has 1kg mass on the Moon but weighs only ~1/6≈0.167kgf. In engineering 'this part weighs 5kg' strictly means mass=5kg, weight≈5kgf=49N. For static calculations at Earth's surface, kg and kgf are numerically equal and can be used interchangeably.
How do I convert kgf and N on a force gauge?
Handheld push-pull force gauges (digital/analog) usually switch between N, kgf, and lbf displays. Conversions: kgf×9.80665=N; N÷9.80665=kgf; lbf×4.448=N. Example: gauge reads 200N≈20.4kgf (~20.4kgf pull force); 10kgf=98.1N. When selecting a gauge, estimate the force range first to choose proper capacity.
Can torque N·m convert to force N?
Not directly—they are different physical quantities: force(N) is linear, torque/moment(N·m) is force×lever arm length (rotational). But given a lever arm length you can calculate torque: Torque(N·m)=Force(N)×LeverArm(m). Example: applying 200N on a 30cm wrench produces torque=200×0.3=60N·m. Use a dedicated torque converter for torque units.
How many kgf is 1kN? Is '1kN=100kg' that engineers say correct?
On construction sites '1kN=100kg' is a rough estimate (100kgf=980N≈1kN)—acceptable for quick mental math, but precise calculation uses 1kN=101.97kgf (~102kgf per kN). Reverse: 1000kgf=9.80665kN≈10kN. So '10kN=1 ton' is also an engineering approximation.
What units are used for spring force calculations?
Spring force F=kx (Hooke's Law): k is spring rate (N/m, N/mm, or lbf/in), x is deflection (displacement), F is spring force (N or lbf). Example: k=5N/mm, compressed 10mm gives F=5×10=50N≈5.1kgf. Spring design, shock absorber selection, and clamp pressure calculations frequently need force unit conversion.
Relationship between weight G and mass m? Why do scales show kg but weight is N in physics?
Weight G=mg (g≈9.80665m/s² at Earth's surface): mass m=1kg has weight G≈9.81N. Digital scales actually measure weight (via strain gauge deformation) then internally divide by g to display mass in kg. So at Earth's surface: scale shows 50kg→weight≈490N; on the Moon (g=1.62m/s²) the same scale would incorrectly read ~8.2kg.
Will my engineering data be uploaded? Is it private?
No upload at all. All conversion logic runs client-side using pure JavaScript in your local browser. Your force values and unit selections make zero network requests—servers cannot see your engineering parameters. Input is cleared immediately when you close the page, suitable for engineering design, bid parameters, and R&D data-sensitive scenarios.
