# The Phenomenon of Motion in Physics

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Society has evolved the meaning of the word motion in terms of physics from ‘a simple movement’ to ‘a change in position, if acted upon by an unbalanced force’. In modern physics, motion is the change in position of an object with respect to its time and its reference point. Motion can be described as both scalar and vector quantity in relation to displacement, speed, direction, velocity, acceleration and time. If an object in not changing its position over time, then it is said to be in a stationary position. Every motion in the universe is explained through the laws of mechanics. The motion of all large scales such as movements in space, humans, and cells is known as the classical mechanism and motion of very small scale, such as in molecules and atoms is known as the quantum mechanics. In the 17th century, the three laws of motion were released after a scientist called Isaac Newton, who explained the modern definition of motion. These laws have now become known as the ‘Newton’s three laws’. The first newtons law, also known as the law of inertia explains what motion is. It is often referred to as ‘An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force’. This portrays that an object has a natural tendency of doing what they are doing with the same speed and in the same direction, however, objects come to a stop due to an external force called inertia. Inertia is a Latin