explian word done by body and work done on body
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it means that body is doing work
it means that work is being going on body
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Work done on a body by a variable force F(x)F(x) in displacing an object from a point a to b is given by
W=∫F(x).ds
This is the general formula for finding work done, provided F(x)F(x) must be resultant force on the body that causes acceleration of body. The above integral is a path integral. If you are dealing with a constant force, then acceleration is constant, and you can see that the above integral reduce to W=F.SW=F.S , where S=b−aS=b−a is the displacement. If you are dealing with bodies have variable acceleration, then the force is a variable force
Work done by a force
Work is done whenever a force moves something over a distance. You can calculate the energy transferred, or work done, by multiplying the force by the distance moved in the direction of the force.
Energy transferred = work done = force x distance moved in the direction of the force
When energy is transferred from chemical energy stored in muscles to ‘uphill energy’ in a raised load, or to ‘elastic energy’ in stretched springs, the energy transferred is a measure of how much work has been done.
Energy transferred = mgh
This second equation is illustrated by raising kilograms onto different height shelves. You can show that the equation is a good summary of what happens. It takes account of the mass, the height raised and whether the kilogram is raised on the Earth or the Moon.
The useful thing which you get from fuels by burning them is the transfer of energy released, to some other energy store such as a raised load, or a moving body.
However, not all the energy available does a useful job. If you lift a lot of bricks, you can get too hot. As well as transferring energy to the raised bricks, some of the energy generated in your muscles warms you up. The transfer of energy is not 100% efficient and not all the energy transferred is represented by mgh. Nor do you know how much total energy is stored by things being ‘uphill’. You can only calculate energy that is transferred.
W=∫F(x).ds
This is the general formula for finding work done, provided F(x)F(x) must be resultant force on the body that causes acceleration of body. The above integral is a path integral. If you are dealing with a constant force, then acceleration is constant, and you can see that the above integral reduce to W=F.SW=F.S , where S=b−aS=b−a is the displacement. If you are dealing with bodies have variable acceleration, then the force is a variable force
Work done by a force
Work is done whenever a force moves something over a distance. You can calculate the energy transferred, or work done, by multiplying the force by the distance moved in the direction of the force.
Energy transferred = work done = force x distance moved in the direction of the force
When energy is transferred from chemical energy stored in muscles to ‘uphill energy’ in a raised load, or to ‘elastic energy’ in stretched springs, the energy transferred is a measure of how much work has been done.
Energy transferred = mgh
This second equation is illustrated by raising kilograms onto different height shelves. You can show that the equation is a good summary of what happens. It takes account of the mass, the height raised and whether the kilogram is raised on the Earth or the Moon.
The useful thing which you get from fuels by burning them is the transfer of energy released, to some other energy store such as a raised load, or a moving body.
However, not all the energy available does a useful job. If you lift a lot of bricks, you can get too hot. As well as transferring energy to the raised bricks, some of the energy generated in your muscles warms you up. The transfer of energy is not 100% efficient and not all the energy transferred is represented by mgh. Nor do you know how much total energy is stored by things being ‘uphill’. You can only calculate energy that is transferred.
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