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physics

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When will your apparent weight be greatest, as measured by a a scale in a moving elevator; when the elevators: (a) accel. downward (b) accel. upward (c) is in free fall (d) moves upward at a constant speed? In what case would you weight be the least? When would it be the same as when you are on the ground?

  • physics -

    Think about it.

    weightapparent=mg+ma where a is up. What if a is down? What if a=-g?

  • physics -

    Apparent weight
    = m(g+a)
    where g=9.8 m/s²
    a=acceleration, positive upwards.
    (a) W=m(g-|a|)
    (b) W=m(g+|a|)
    (c) W=m(g-|g|) = 0
    (d) W=m(g+|0|) = mg

  • physics -

    so the it would be the least on the way down, b/c your force, pushing on the scale is less. And it is greatest on the way up, since your force of push is stronger. And I would say in free fall it is the same as ground state?

  • physics -

    Rethink free-fall.

  • physics -

    ohh okay so the weight would be the same on the ground if its moving up at a constant speed?

  • physics -

    Exactly. When it moves upwards (or downwards) at a uniform velocity, the reaction on the floor is the same as the weight. You have probably experienced this when you ride on an elevator.

  • physics -

    sweet!! thank you =)

  • physics -

    You're welcome!

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