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6 January, 23:43

Which is more work, pushing with 115 N over 15m or lifting 20N over 10 m?

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  1. 7 January, 01:06
    0
    Work = (force) x (distance)

    You could look at the two cases, and see right away that

    the first one has more force acting through more distance,

    so it must be more work. But since I just gave you the formula

    for Work, let's calculate the amount of it for both cases:

    First case: Work = (115 N) x (15 m) = 1,725 joules

    Second case: Work = (20 N) x (10 m) = 200 joules

    The first case involves 8.625 times as much work as the second case.
  2. 7 January, 03:41
    0
    Work is simply the force applied over a distance.

    Work = Force * Displacement (m) ... In some cases where an angle is involved cosФ (theta) is used

    Work = F * D (m) * Cos (an angle measure)

    So for lifting the object cos (90°) would be used ... while pushing cos (0°)

    When you work out the formula for each it should be clear what the correct answer is.
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