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Is the weight lifter doing the same amount of work when he lifts the 1200N barbell 1m the same as when he lifts the same barbell 2m? Explain answer


Is my answer correct in the first problem?



Answer :

Eduard22sly

The weight lifter is doing different amount of work when he lift the 1200 N barbell to height 1 m and 2 m

How do I determine if the amount of workdone is the same or not?

To know if the workdone by the weight lifter is the same or not, we shall determine the workdone by the lifter in both case. Details below:

  • Force = 1200 N
  • Hight (h) = 1 m
  • Workdone (Wd) =?

Work done (Wd) = force (F) × height (h)

Wd = 1200 × 1

Wd = 1200 J

  • Force = 1200 N
  • Hight (h) = 2 m
  • Workdone (Wd) =?

Work done (Wd) = force (F) × height (h)

Wd = 1200 × 2

Wd = 2400 J

From the above calculation, we can see that the workdone is different.

Thus, we can stay that the weight lifter is doing different amount of work

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