Weightlessness
The phenomenon when an object’s effective weight becomes zero is known as weightlessness. For example, astronauts in the space station orbiting around the Earth experience the condition of weightlessness and float freely inside the station. Other than this, some more examples include passengers on board an aeroplane, people inside a free-falling elevator, divers and swimmers (due to the buoyancy of water) who can also feel the same, etc.
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Mass and Weight
Mass and Weight are commonly used in the same manner by the general masses but there are differences between both Mass and Weight, where Mass is the measure of Inertia unlike Weight which is a measure of force acting on a body towards the heavy body. But yet still many people use these two terms interchangeably.
As we know that to change the speed or direction of an object, a force is required. If you drop anything from a great height, it will fall towards the earth’s surface. The planet revolves around the Sun and the moon revolves around the earth. There must be some force operating on objects, planets, and other celestial bodies. Isaac Newton noted that the same force is responsible for all these. This force is called gravitational force.