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I am trying to work out the difference in force exerted by either a press or a power hammer.

I worked out that the kinetic energy of a hammer is calculated as E = ½mv².

Hammer: 0.5 * 30 kg * (15m/sec)sq = 3.375 KJ

How does this relate to the force exerted by a 20 ton press, where the momentum/velocity doesn't really matter that much, or does it, if it is only 0.01 m/s ?

0.5 * 20000 kg * (0.01m/sec)sq = 1 KJ

That doesn't make sense, does it ?

That press would surely move the metal as much as the 30kg hammer blow . . .

There must be another comparison between pressure and kinetic energy.

What about this relation : 1 tonne-force = 9806.65 N = 9807 joule/meter ?

So the 20 ton press would exert a force of 196.13 KJ/meter ?

Still doesn't seem right . . .

Can anyone help me with this ? It's been bothering me for ages.

Thanks, Benjamin

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# Press versus hammer, kinetic energy vs pressure

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