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Joined: Nov 2002
Posts: 180
member
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member
Joined: Nov 2002
Posts: 180 |
"Although not commonly *conceived as such, isn't work a formulae; weight*height*distance='foot lbs.'?"
Uh oh. Now I'm in over my head. I learned this stuff so long ago I don't know the official by God explanation any more. I can just see how it works. My daughter probably knows the formula, bein' a physics whiz and all, but I'm afraid to ask.
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Joined: Mar 2000
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Carpal Tunnel
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Carpal Tunnel
Joined: Mar 2000
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Carpal Tunnel
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Carpal Tunnel
Joined: Dec 2000
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...but I'm afraid to ask.
It sounds like too much work.
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Joined: Mar 2002
Posts: 1,692
Pooh-Bah
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Pooh-Bah
Joined: Mar 2002
Posts: 1,692 |
To put it simply, in Mechanics, Work is force multiplied by distance. The Work done in lifting a weight from the ground is equal to the weight in pounds times the height lifted in feet giving an answer in foot-pounds (using old money here!). The force you exert in lifting the weight is in opposition to the vertical force of gravity that is trying to make it drop again. How far you moved the weight horizontally doesn’t affect the work done in raising it. The force used in moving horizontally has to overcome friction and air resistance. It is easier to visualise if you think of the lifting and moving actions being performed by a crane rather than by a person.
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Joined: Nov 2002
Posts: 180
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Joined: Nov 2002
Posts: 180 |
"It is easier to visualise if you think of the lifting and moving actions being performed by a crane rather than by a person. "
But why would any self-respecting wetlands bird waste its time lifting.... oh. Yes. Yes, you're absolutely right.
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Joined: Mar 2002
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Pooh-Bah
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Pooh-Bah
Joined: Mar 2002
Posts: 1,692 |
Cranes are good - so long as they don't block your chimney I guess. We don't get them here. We get Herons though - they're horrid - spend their time lifting my goldfish.
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Joined: Dec 2000
Posts: 2,661
Carpal Tunnel
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Carpal Tunnel
Joined: Dec 2000
Posts: 2,661 |
How far you moved the weight horizontally doesn’t affect the work done in raising it.
Sounds accurate, but, then... "time spent exerting the opposing force" should count... somehow...
--------
... it's the same *reason one runs to avoid time spent in the rain... assuming being 'drier' is the goal, of course.
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Joined: Apr 2000
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Carpal Tunnel
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Carpal Tunnel
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>it's the same *reason one runs to avoid time spent in the rain..
but.. but.. don't you encounter more drops that way?
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Joined: Mar 2000
Posts: 1,027
old hand
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old hand
Joined: Mar 2000
Posts: 1,027 |
in Mechanics, Work is force multiplied by distance. That's right, but this sort of work, unfortunately is not what earns you top salaries. There would be rather more social justice if it were so.
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Joined: Dec 2000
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Carpal Tunnel
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Carpal Tunnel
Joined: Dec 2000
Posts: 2,661 |
but.. but.. don't you encounter more drops that way?...not until you are moving faster than the falling rain.
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