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Q: What does hovering for an eternity and destroyed in an instant mean?
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Does it mean a pencil is falling if you were in a freely falling elevator and you dropped a pencil and saw that the pencil was hovering?

In the unlikely event you find yourself in a freely-falling elevator, then the relative motion of the pencil is among the least of your concerns.If the pencil were hovering, then both you and the pencil are in free-fall.A condition that is not permanent for you and me, and it will eventually stop.This is commonly referred to as zero gravity, but should be called zero net gravity, for in your space station, gravity still acts - but it is exactly balanced out by centrifugal force. If gravity actually became zero, then your space station would speed off into space.


What does conservation of energy mean to a scientist?

It means that energy cannot be created nor destroyed, but it can change from one form to another.(for example, mechanical energy to heat energy.)


What do scientists mean when they say energy can never be destroyed?

It means that the total amount of energy in a closed system - a system that has no contact with the outside world - will neither increase nor decrease.


What does it mean when the net charge is conserved in a closed system?

It implies the law of conservation of energy. Energy can neither be created nor destroyed. It can oonly be changed from one form to another.


Does conservation of energy mean saving energy?

The law of "conservation of energy" states that energy can neither be created nor destroyed by any chemical or physical means. These days, many scientists are talking about conservation. Conserving energy does mean saving energy.