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Anonymous Poster #1

Energies Of Lifting And Falling

09/11/2011 1:29 PM

Is the amount of energy released by a falling object the same as the amount of energy spent in lifting it up to the same height?
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edignan
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#1

Re: energies of lifting and falling

09/11/2011 1:48 PM

Accurately, the calculated amount of energy equals the calculated amount of potential energy, rather than actual energy to lift to the height. The difference is the losses of reality.

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MJCronin
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#3
In reply to #1

Re: energies of lifting and falling

09/12/2011 8:05 AM

"the losses of reality" are most of the losses that we see on this sorry forum....

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34point5
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#2

Re: Energies Of Lifting And Falling

09/11/2011 9:57 PM

Yes - given friction free 100% efficiency in a vacuum. Otherwise, No.

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Anonymous Poster #1
#4

Re: Energies Of Lifting And Falling

09/12/2011 10:46 AM

What about the kinetic energy of a hammer ? It is easier driving nails with hammer than pressing them with it. We are not gaining more energy utilizing gravity force?
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pantaz
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#5
In reply to #4

Re: Energies Of Lifting And Falling

09/12/2011 2:47 PM

No.
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edignan
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#6
In reply to #4

Re: Energies Of Lifting And Falling

09/12/2011 10:32 PM

Yeah sorry, not really once the value of gravity is surpassed by the force of the swing.

Now if you move to a really BIG hammer, gravity counts more because you have limited ability to swing it.

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