- #1

rudransh verma

Gold Member

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- Homework Statement
- A passenger of mass ##m=72.2 kg## stands on a scale in an elevator cab. We are concerned with the scale reading when the cab is stationary and when it’s moving. ie ##F_N=m(g+a)##.

When the cab is stationary or moving up with constant velocity what is its scale reading. ie ##F_N=708 N##. This is the weight of the passenger.

What does the scale read if the cab accelerates with ##3.20 m/s2## upwards and downwards. ie ##F_N=939## and ##477 N##.

For an upward acceleration the scale reading is greater than the passengers weight.

” That reading is a measurement of an apparent weight because it’s made in non inertial frame”.

I don’t understand this line.

During the upward acceleration what is the magnitude ##F_{net}## of the net force on the passenger and what is the magnitude ##a_{p,cab}## of his acceleration as measured in the frame of cab. Does ##\vec F_{net}=m\vec a_{p,cab}## ?

- Relevant Equations
- ##\vec F=m\vec a##

I mentioned answers above in the question.