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Hi guys!I realized that I don't understand what's going on when an object rests on the table :-)Gravitational force is applied to the table by the object (which I found out is stress force) and the table is exerting opposite force of the exact amount to keep the object lying there.
But what is exactly going on inside the table? The molecules are kept together by binding energy, so the stress force is counteracted by these forces?
How does the table react to this force? Is it stored by deformity?
When we lift the object off the table, the table is somehow "relieved". Is it translated to its deformity disappearing and the table regaining its shape?
Thanks!So could we say that that the gravitational force is counteracted by energy (that keeps the table together)?
Also, when we lift the object off and it regains shape, does it lose temperature?
Is the energy to be described by the W=F * delta L equation?
(where delta L is the length to which the table is deformed.) Of course, here we suppose a very elastic table.
And yet, the more I write about it the more I get suspicious of the whole "force" concept. Aren't we talking about energy all the time?
Maybe force is potential energy?
No. You're confusing force with energy.
carrying a tray, straight above me head, is that 'work done'?