Answer to Question #101235 in Mechanics | Relativity for Kishu

Question

What is gravity, light, time? Explain in detail.

Answer 1

Gravity is a mutual force, every object attracts other objects depending on some parameters: mass of the first body, mass of the second body, and the distance between their centers of mass.The heavier the objects, the stronger the force. Also, the closer they are, the stronger it is. The only reason your effect on me or on earth isn't noticeable is because your mass isn't that high!

Light is electromagnetic radiation; i.e. , it is a moving wave composed of oscillating electric fields and oscillating magnetic fields. This radiation allows for radio signals, cellphone signals, WiFi signals, microwave ovens, light visible to our eyes, x-rays, as well as the gamma radiation we encounter with nuclear weapons.

Time is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future.

Time in physics is defined by its measurement: time is what a clock reads. In classical, non-relativistic physics it is a scalar quantity and, like length, mass, and charge, is usually described as a fundamental quantity