Gravity- is measured by the acceleration that it gives to freely falling objects.
Light- or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye.
Mass-in physics, quantitative measure of inertia, a fundamental property of all matter.
Wave-a disturbance or variation that transfers energy.
Time- is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present
#HopeIthelps
