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For other uses, see Force (disambiguation).
In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newtons and represented by the symbol F.
Force
Force examples.svg
Forces can be described as a push or pull on an object. They can be due to phenomena such as gravity, magnetism, or anything that might cause a mass to accelerate.
Common symbols
F→, F, F
SI unit
newton (N)
Other units
dyne, pound-force, poundal, kip, kilopond
In SI base units
kg·m/s2
Derivations from
other quantities
F = m a
Dimension
{\displaystyle {\mathsf {L}}{\mathsf {M}}{\mathsf {T}}^{-2}}{\displaystyle {\mathsf {L}}{\mathsf {M}}{\mathsf {T}}^{-2}}
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