Force

In <a href="https://en.wikipedia.org/wiki/Physics" title="Physics">physics</a>, a force is any interaction that, when unopposed, will change the <a href="https://en.wikipedia.org/wiki/Motion%28physics%29" title="Motion (physics)">motion</a> of an <a href="https://en.wikipedia.org/wiki/Physical_body" title="Physical body">object</a>.<a href="https://en.wikipedia.org/wiki/Force#cite_note-1">[1]</a> In other words, a force can cause an object with <a href="https://en.wikipedia.org/wiki/Mass" title="Mass">mass</a> to change its <a href="https://en.wikipedia.org/wiki/Velocity" title="Velocity">velocity</a> (which includes to begin moving from a <a href="https://en.wikipedia.org/wiki/Newton%27s_first_law" class="mw-redirect" title="Newton's first law">state of rest</a>), i.e., to <a href="https://en.wikipedia.org/wiki/Accelerate" class="mw-redirect" title="Accelerate">accelerate</a>. Force can also be described by intuitive concepts such as a push or a pull. A force has both <a href="https://en.wikipedia.org/wiki/Euclidean_vector#Length" title="Euclidean vector">magnitude</a> and <a href="https://en.wikipedia.org/wiki/Direction%28geometry,geography%29" class="mw-redirect" title="Direction (geometry, geography)">direction</a>, making it a <a href="https://en.wikipedia.org/wiki/Vector%28geometric%29" class="mw-redirect" title="Vector (geometric)">vector</a> quantity. It is measured in the <a href="https://en.wikipedia.org/wiki/SI_unit" class="mw-redirect" title="SI unit">SI unit</a> of <a href="https://en.wikipedia.org/wiki/Newton_%28unit%29" title="Newton (unit)">newtons</a> and represented by the symbol F.

The original form of <a href="https://en.wikipedia.org/wiki/Newton%27s_second_law" class="mw-redirect" title="Newton's second law">Newton's second law</a> states that the net force acting upon an object is equal to the <a href="https://en.wikipedia.org/wiki/Time_derivative" title="Time derivative">rate</a> at which its <a href="https://en.wikipedia.org/wiki/Momentum" title="Momentum">momentum</a> changes with time. If the mass of the object is constant, this law implies that the <a href="https://en.wikipedia.org/wiki/Acceleration" title="Acceleration">acceleration</a> 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 <a href="https://en.wikipedia.org/wiki/Mass" title="Mass">mass</a> of the object

Related concepts to force include: <a href="https://en.wikipedia.org/wiki/Thrust" title="Thrust">thrust</a>, which increases the velocity of an object; <a href="https://en.wikipedia.org/wiki/Drag%28physics%29" title="Drag (physics)">drag</a>, which decreases the velocity of an object; and <a href="https://en.wikipedia.org/wiki/Torque" title="Torque">torque</a>, which produces <a href="https://en.wikipedia.org/wiki/Angular_acceleration" title="Angular acceleration">changes in rotational speed</a> 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 so-called <a href="https://en.wikipedia.org/wiki/Stress%28mechanics%29" title="Stress (mechanics)">mechanical stress</a>. <a href="https://en.wikipedia.org/wiki/Pressure" title="Pressure">Pressure</a> is a simple type of stress. Stress usually causes <a href="https://en.wikipedia.org/wiki/Deformation_%28engineering%29" title="Deformation (engineering)">deformation</a> of solid materials, or flow in <a href="https://en.wikipedia.org/wiki/Fluid" title="Fluid">fluids</a>.

Force

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