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Acceleration (m/s2)
Angle [plane] (rad)
Area (sqm)
Data Storage (B)
Data Transfer Rate (B/s)
Density (kg/m3)
Electric Charge (C)
Electric Current (A)
Electric Resistance (Ω)
Energy (J)
Force (N)
Frequency (Hz)
Fuel (km/L)
Length [m]
Mass, Weight (kg)
Mass Flow Rate (kg/s)
Power (W)
Pressure (Pa)
Speed (m/s)
Temperature (K)
Time (s)
Torque (N.m)
Volume (L)
Volume Flow Rate (m3/s)
Quantity (i)

The original form of Newton's second law states that the net force acting upon an object is equal to the rate at which its momentum changes with time. If the mass of the object is constant, this law implies that the acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional to the mass of the object.

Concepts related to force include: thrust, which increases the velocity of an object; drag, which decreases the velocity of an object; and torque, which produces changes in rotational speed of an object. In an extended body, each part usually applies forces on the adjacent parts; the distribution of such forces through the body is the internal mechanical stress. Such internal mechanical stresses cause no accelation of that body as the forces balance one another. Pressure, the distribution of many small forces applied over an area of a body, is a simple type of stress that if unbalanced can cause the body to accelerate. Stress usually causes deformation of solid materials, or flow in fluids.

- Atomic Units Of Force (auf) ⇛
- Attonewtons (aN) ⇛
- Centigrams Force (cgf) ⇛
- Centinewtons (cN) ⇛
- Decanewtons (daN) ⇛
- Decinewtons (dN) ⇛
- Dynes (dyn) ⇛
- Exanewtons (EN) ⇛
- Femtonewtons (fN) ⇛
- Giganewtons (GN) ⇛
- Grams Force (gf) ⇛
- Graves Force (grv.f) ⇛
- Hectonewtons (hN) ⇛
- Joules Per Centimeter (J/cm) ⇛
- Joules Per Meter (J/m) ⇛
- Kilograms Force (kgf) ⇛
- Kilonewtons (kN) ⇛
- Kiloponds (kp) ⇛
- Kilopounds Force (kpf) ⇛
- Kips (kip) ⇛
- Megagrams Force (Mgf) ⇛
- Meganewtons (MN) ⇛
- Micrograms Force (µgf) ⇛
- Micronewtons (µN) ⇛
- Milligrams Force (mgf) ⇛
- Milligraves Force (mgrv.f) ⇛
- Millinewtons (mN) ⇛
- Nanonewtons (nN) ⇛
- Newtons (N) ⇛
- Ounces Force (ozf) ⇛
- Petanewtons (PN) ⇛
- Piconewtons (pN) ⇛
- Ponds (p) ⇛
- Pound Foot Per Square Second (lbf/s2) ⇛
- Pound Yard Per Square Second (lb.yd/s2) ⇛
- Poundals (pdl) ⇛
- Pounds Force (lbf) ⇛
- Sthenes (sn) ⇛
- Stones Force (stf) ⇛
- Teranewtons (TN) ⇛
- Tonnes Force (tf) ⇛
- Tons Force[long] (tf long) ⇛
- Tons Force[metric] (tf metric) ⇛
- Tons Force[short] (tf short) ⇛
- Yoctonewtons (yN) ⇛
- Yottanewtons (YN) ⇛
- Zeptonewtons (zN) ⇛
- Zettanewtons (ZN) ⇛

- Exanewtons -> Newtons
- Newtons -> Exanewtons
- Tonnes Force -> Piconewtons
- Piconewtons -> Tonnes Force
- Sthenes -> Tons Force[short]
- Tons Force[short] -> Sthenes
- Ponds -> Centinewtons
- Centinewtons -> Ponds
- Grams Force -> Yoctonewtons
- Yoctonewtons -> Grams Force
- Stones Force -> Graves Force
- Graves Force -> Stones Force
- Kilopounds Force -> Kips
- Kips -> Kilopounds Force
- Pound Yard Per Square Second -> Petanewtons
- Petanewtons -> Pound Yard Per Square Second
- Femtonewtons -> Centigrams Force
- Centigrams Force -> Femtonewtons
- Zeptonewtons -> Yottanewtons
- Yottanewtons -> Zeptonewtons