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Explain why the amount of work that a machine does is less than the amount put into the machine?
Output work is always less than input work.
How can you increase the work output of a machine?
the only way to increase the work output is to increase the amount of work you put into the machine.
What does efficiency tell you about a machine?
The efficiency of a machine tells you how much usefull energy it will put out compared to the amount of energy that's put in. The usefull output energy is usually less (never greater) then the input because of energy loss due to frictional heating. For example if 120 joules of energy or work is put into a lifting machine, you might only get out 110 joules of lifting work because 10 joules is lost to heat. The efficiency of the machine is then ; (110/120) x 100% = 91.7% . I think for most practical machines anything above 90% efficient is quite good. (The terms work & energy are used interchangebly here because work is a transfer of energy).
If machines make work easier explain Why most machines actually increase the amount of work you do in accomplishing a task?
No machine is 100% efficient. The amount of work you get out of the machine is always something less than the amount of work you put into it. So you have to put in more work than the job actually requires. It's the price you pay for making the job 'easier' by using the machine to do it.
Why cant a machine put as much energy out as you put in?
Losses of energy within the machine- some of the energy is used up by friction, and converted to heat. There is also the matter of efficency of a machine. The less efficent, the more power you must put in to get the same output.
Why is the amount of that a machine does is less than the amount put into the machine?
In such a machine, the remaining energy is wasted to friction
Explain why the amount of work that a machine does is less than the amount put into the machine?
Output work is always less than input work.
How can you increase the work output of a machine?
the only way to increase the work output is to increase the amount of work you put into the machine.
What does efficiency tell you about a machine?
The efficiency of a machine tells you how much usefull energy it will put out compared to the amount of energy that's put in. The usefull output energy is usually less (never greater) then the input because of energy loss due to frictional heating. For example if 120 joules of energy or work is put into a lifting machine, you might only get out 110 joules of lifting work because 10 joules is lost to heat. The efficiency of the machine is then ; (110/120) x 100% = 91.7% . I think for most practical machines anything above 90% efficient is quite good. (The terms work & energy are used interchangebly here because work is a transfer of energy).
The comparison between output work imput work is?
Work input is how much work you put into a machine and work output is the work done by the machine according to how much work you put into it. You will never get more work out of a machine than you put into it. The efficiency of a machine is how much useful work you got out of the machine compared to how much you put in (expressed in a percent). Efficiency = Useful Work Output ÷ Work Input
The amount of work you get from an engine divided by the energy you put into it?
Efficiency
If machines make work easier explain Why most machines actually increase the amount of work you do in accomplishing a task?
No machine is 100% efficient. The amount of work you get out of the machine is always something less than the amount of work you put into it. So you have to put in more work than the job actually requires. It's the price you pay for making the job 'easier' by using the machine to do it.
What is the ratio of work put out of a machine to the work put in is its?
It is the efficiency of the machine.
How do you calculate efficiency and how is it expressed?
For efficiency, you have to consider the energy or work that you get out of the machine, compared to the energy or work that you put into the machine. Its what you get out, divided by what you put in. By multiplying the result by 100, you should then get the efficiency expressed as a percentage, which is the normal way of describe how efficient a machine or process is. efficiency = (Work out/Work in) x 100 Sometimes you are given the efficiency in a problem, but then have to calculate either the work out or work in, so then its just a case of rearranging the equation above.
How much work put into a machine is changed to useful work put out by the machine?
90%
In what way is a machine subject to the law of energy conservation?
The law of conservation of energy was never found to be violated. The relevance for a machine is that a machine can not produce more energy than is put into the machine.
Why cant a machine put as much energy out as you put in?
Losses of energy within the machine- some of the energy is used up by friction, and converted to heat. There is also the matter of efficency of a machine. The less efficent, the more power you must put in to get the same output.
