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In [[physics]], '''force''' is anything that can cause a [[mass]] to accelerate. It may be experienced as a lift, a push, or a pull. The acceleration of the body is proportional to the [[vector sum]] of all forces acting on it (known as ''net force'' or ''resultant force''). In an extended body, force may also cause rotation, deformation, or an increase in pressure for the body. Rotational effects are determined by the torques, while deformation and pressure are determined by the [[stress]]es that the forces create.  

In [[physics]], '''force''' is anything that can cause a [[mass]] to accelerate. It may be experienced as a lift, a push, or a pull. The acceleration of the body is proportional to the [[vector sum]] of all forces acting on it (known as ''net force'' or ''resultant force''). In an extended body, force may also cause rotation, deformation, or an increase in pressure for the body. Rotational effects are determined by the torques, while deformation and pressure are determined by the [[stress]]es that the forces create.  

Net force is mathematically equal to the rate of change of the [[momentum]] of the body. Since [[momentum]] is a [[vector]] [[quantity]] (has both a magnitude and direction), force also is a vector quantity.

Net force is mathematically equal to the rate of change of the [[momentum]] of the body. Since [[momentum]] is a [[vector]] [[quantity]] (has both a magnitude and direction), force also is a vector quantity.

The concept of force has formed part of statics and dynamics since ancient times. Ancient contributions to statics culminated in the work of [[Archimedes]] in the 3rd century BC, which still forms part of modern physics. In contrast, [[Aristotle]]'s dynamics incorporated [[intuition|intuitive]] misunderstandings of the role of force which were eventually corrected in the 17th century, culminating in the work of [[Isaac Newton]]. Following the development of [[quantum mechanics]] it is now understood that particles influence each another through fundamental interactions, making force a redundant concept.  Only four fundamental interactions are known: ''strong'', ''electromagnetic'', ''weak'' (unified into one electroweak interaction in 1970s), and ''gravitational''. (in order of decreasing strength).

The concept of force has formed part of statics and dynamics since ancient times. Ancient contributions to statics culminated in the work of [[Archimedes]] in the 3rd century BC, which still forms part of modern physics. In contrast, [[Aristotle]]'s dynamics incorporated [[intuition|intuitive]] misunderstandings of the role of force which were eventually corrected in the 17th century, culminating in the work of [[Isaac Newton]]. Following the development of [[quantum mechanics]] it is now understood that particles influence each another through fundamental interactions, making force a redundant concept.  Only four fundamental interactions are known: ''strong'', ''electromagnetic'', ''weak'' (unified into one electroweak interaction in 1970s), and ''gravitational''. (in order of decreasing strength).