Chose the correct answer: A Block of mass M rests on a scale on the floor of an

Question

Chose the correct answer:

A Block of mass M rests on a scale on the floor of an elevator that is initially moving down at a constant speed. The elevator slows at a constant rate then stops. it then accelerates uo until it reaches a constant upward speed. what can you say about the weight of the block as measured by the scale during this trip?

- the weight is initially Mg, then it increase as the elevator decelerates ans is back to being Mg when it stops. the weight then increases as the elevator accelerates upward, and is back to being Mg when it reaches a constant upward speed.

-the weight is initially Mg, then it decreases as the elevator accelerates and is back to Mg when it stops. the weight then increases as the elevtor accelerates upward, and is back to being Mg when it reaches a constant upeward speed.

-the weight is an initially property of the object and does not change.

Explanation / Answer

If the elevator is at rest or moving at constant velocity, the weight is equal to normal force

N = mg - ma if the elevator has a downward acceleration

N = mg + ma if the elevator has an upward acceleration

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The weight is initially Mg, then it decreases as the elevator accelerates and is back to Mg when it stops. the weight then increases as the elevtor accelerates upward, and is back to being Mg when it reaches a constant upeward speed.

Thus, the second option is correct.

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