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

“ How is your apparent weight affected by the motion of an elevator?”. Scale reads the normal force, F N , here R. Mass is not the same as weight. The girl’s mass never changes, but her weight does. Summary: Scale reads true weight if: Elevator stationary

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

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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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