# physics

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#1
what is the work done by a lift which takes four people each weighing 600n from the ground floor to the top floor, which is a distance of 125 metres
Last edited by mclapt; 2 years ago
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2 years ago
#2
(Original post by mclapt)
what is the work done by a lift which takes four people each weighing 600n from the ground floor to the top floor, which is a distance of 125 metres
Someone quite clearly gave you a formula of working out the Work Done in that
Work Done = Force x Distance
or if you prefer it a different way
Work Done =
Last edited by M4cc4n4; 2 years ago
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#3
(Original post by M4cc4n4)Someone quite clearly gave you a formula of working out the Work Done in that

Work Done
i dont get it
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#4
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2 years ago
#5
(Original post by mclapt)
No, that integral is simply another way of expressing the equation you were giving, think of it this way.

4 People who each weigh 600 N are being raised by 125m, so each one is exerting a force 600 N downward, so there must be an equal and opposite 600N force pulling them up that that distance of 125m, so you have the Force that is moving each one and the Distance so first work out the Work done for 1 person which is 600D, and then work out the Work Done moving all 4 people in the Elevator, hopefully this helps
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#6
(Original post by M4cc4n4)No, that integral is simply another way of expressing the equation you were giving, think of it this way.

4 People who each weigh 600 N are being raised by 125m, so each one is exerting a force 600 N downward, so there must be an equal and opposite 600N force pulling them up that that distance of 125m, so you have the Force that is moving each one and the Distance so first work out the Work done for 1 person which is 600D, and then work out the Work Done moving all 4 people in the Elevator, hopefully this helps
sorry i still dont get it
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2 years ago
#7
The equation: WORK DONE = FORCE X DISTANCE.
Work done is measured in Joules, force is measured in Newtons and distance is measured in Metres.
That means you don't need to convert any units as the basis of your question is already in Newton and Metres.
The next step is to see that there is 'four people' - key element in your equation WHICH WEIGH 600N each.
Therefore you need to do 600 x 4 = 2400 (this gives the total force exerted)
So now you can go back to your equation WORK DONE = FORCE X DISTANCE, and you would do 2400 x 125 = 300,000 J (your answer).
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