Physics Course/Force/Types of Force

Gravitational Force The attractive force between any two masses, most noticeable between the Earth and objects on it. Expressed by Newton’s law of gravitation: F=Gr2m1​m2​​ Frictional Force A resistive force that opposes motion when two surfaces are in contact. Elastic Force The restoring force exerted by an elastic object, such as a spring, following Hooke’s law: Spring elastic force String elastic force Normal Force The perpendicular contact force exerted by a surface to support the weight of an object. Tension Force Force transmitted through a string, rope, or cable when it is pulled tight. Electromagnetic Force Includes electric forces between charged particles and magnetic forces due to moving charges. Applied Force Any external push or pull on an object.