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What Does a Spring Scale Measure, Part 3

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Let's see if you got the right answer. Did you say 10 N? This surprises a lot of people but let's find out why it makes sense. Think back to the situation where I was holding the scale vertically with the 10 N bottle of sand. The only difference between this time and then is instead of myself applying the 10 N force to hold the scale, this bottle is supplying the force of 10 N to hold the scale. So in any case, the scale is kept from moving by a 10N force pulling on it. So we have a 10 N weight pulling on it, that we are measuring, and we have a 10 N force holding it stationary, so the reading should be 10 N

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