Physics Course/Force

Force is a physical quantity that describes the interaction between objects which can cause a change in an object’s motion or shape. The SI unit of force is the newton (N), named after Sir Isaac Newton, who formulated the fundamental laws of motion. In mechanics, a force can accelerate a mass, change its direction, or deform it . In classical mechanics, force is commonly defined using Newton’s second law of motion: where: . Force . Mass . Acceleration Force is a vector quantity, meaning it has both magnitude and direction. /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 / Force and Motion /