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What will the spring scale read if the elevator is moving upward at constant speed?
12-04-2012, 02:47 AM
Post: #1
What will the spring scale read if the elevator is moving upward at constant speed?
Consider the video tutorial you just watched. Suppose that we duplicate this experimental setup in an elevator. What will the spring scale read if the elevator is moving upward at constant speed?

A. More than 18 N
B. 18 N
C. Less than 18 N but greater than 0 N
D. 0 N

Here is a picture of what the setup looks like:

http://i1001.photobucket.com/albums/af13...ysics2.png

The video just showed that the spring scale at the top reads 18 N, which is the mass of each of the two blocks attached by separate strings to the scale at opposite ends.

I am thinking that since the elevator is moving at a constant speed, there is a net force of 0, so the value will remain the same. Am I correct in thinking this way?

Thanks for your help!

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12-04-2012, 02:55 AM
Post: #2
 
you are correct.
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