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Elevator Motion Effects on Apparent Weight Calculation

Understand the relationship between elevator motion and apparent weight variations. Discover how an elevator's movement influences scale readings, accurately determining the true weight based on static, upward, and downward motions.

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Elevator Motion Effects on Apparent Weight Calculation

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  1. “ How is your apparent weight affected by the motion of an elevator?”

  2. Scale reads the normal force, FN , here R.

  3. Mass is not the same as weight. The girl’s mass never changes, but her weight does.

  4. Summary: • Scale reads true weight if: • Elevator stationary • Moving with a constant velocity, up or down.. • Scale reads greater than the true weight if elevator accelerating upward. • Speeding up going up • Slowing down going down • Scale reads less than the true weight if elevator is accelerating down. • Speeding up going down. • Slowing down going up. • Scale always reads the normal force LINK

  5. A passenger of mass m = 72.2 kg stands on a platform scale in an elevator. We are concerned with the scale readings when the cab is stationary, and when it is moving up or down. Find a general solution for the scale reading, whatever the vertical motion of the cab.

  6. What does the scale read • if the cab is stationary or • moving upward at a • constant 0.50 m/s?

  7. What does the scale read • if the cab accelerates • upward at 3.20 m/s2 and • downward at 3.20 m/s2?

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