Mentor's note: Moved from HW for a better fit
Homework Statement:: A joule is defined as "the energy transferred to an object when a force of one Newton acts on that object in the direction of its motion through a distance of one meter."
Explain this definition.
Relevant Equations:: 1J = 1N.m
This is not a homework but just a question I'm asking myself. I did not found a more appropriate forum, sorry if this one is inappropriate.
I can't grasp the idea of the Joule definition. Here's my current state of understanding and some questions that are bugging me:
The joule represents an amount of 'energy' (I used 'energy' in the common sense).
In the Joule definition, there is mention of "in the direction of its motion", which means the Joule in only defined for moving objects?
Also, if I push a 1kg object for 1m (on a table, for left to right, for example) with a force of 1N, I used a certain amount of energy.
If I push a 10kg object for 1m with a force of 1N in the same setting, I used more energy, as the object took more time to go through this meter and thus I had to apply this 1N force for more time.
I have the impression that this is not taken into account (well, of course it is, but I don't see how) in the Joule definition.
Can somebody help me clarify this?
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