Movement (or motion) is the process of changing position or location. Movement may occur in living beings and in non-living things. For example, a person moves when they walk or run. A rock moves when it is carried by a river.
In physics, movement is described using the laws of motion. These laws explain how objects move when they are acted upon by forces. The three laws of motion were first proposed by Isaac Newton in 1687 and are still used today to describe the motion of objects.
The first law of motion, also known as the law of inertia, states that an object will remain at rest or continue moving in a straight line unless it is acted upon by an external force. This means that an object will not start moving on its own or change direction unless something else makes it do so.
The second law of motion states that the force required to move an object is proportional to the mass of the object and the acceleration that is produced. This means that more massive objects require more force to move them than less massive objects and that objects can be accelerated more quickly if more force is applied to them.
The third law of motion states that for every action there is an equal and opposite reaction. This means that if one object exerts a force on another object, then the second object will exert an equal and opposite force back on the first object.