Physics

A 75.0-kg person stands on a scale in an elevator. What does the scale read (in N) when the elevator is at rest? What does the scale read (in N) when the elevator is climbing at a constant speed of 3.0 m/s? What does the scale read (in N) when the elevator is descending at 3.0 m/s? What does the scale read (in N) when the elevator is accelerating upward at 2.5 m/s2 ? What does the scale read (in N) when the elevator is accelerating downward at 2.5 m/s2 ?

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  1. on earth
    at rest
    75 kg * 9.8 m/s^2 = x Newtons

    at constant speed, no acceleration, still the same 75*9.81

    still at constant speed down, still the same

    acc up = 2.5 m/s^2, now we are getting somewhere
    net Force up on person = m * 2.5 m/s^2
    weight force down on person = m g = m * 9.8
    scale force up - m g = m a
    scale force up = m (g+a) = 75 ( 9.8 + 2.5)
    if a = -2.5 then
    75 (9.8 - 2.5)

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    Damon
  2. w=750N

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