Question

Is the string broken when the whole system is pulled quickly up ?​

Answer 1

Answer:

yes it's true

Explanation:

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Answer 2

Answer:

There is a 22 kg block with 2 identical strings attached to it: one at the top, the other at the bottom.

The top string is attached to a "ceiling", and the bottom to a "floor".

Professor Lewin "stretches" the system (by pulling on the bottom string) with the block not accelerating.

One string snaps.

Prediction:

Initially, the top string has a tension of approximately 2020 N, to counter the force of gravity. The bottom string has no tension at all.

Then, when Lewin pulls the bottom string, it gains some tension nn N. To counter act the force exerted by the bottom string, the top string exerts now 20+n20+n N.

I assume that the string with more force will give out sooner, leading me to conclude that the top string will break.

Results:

(This was conducted by Lewin, not me; see link above.)

Trial 1: Bottom string breaks.

Trial 2: Top string breaks.

Trial 3: Bottom string breaks.