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Audio Video Interleaved Video  |  2012-12-18  |  6.4 MB  |  400x400  |  1fps  |  3 minutes, 39 seconds
Transcription: This example comes in two parts, so let's tackle each part individually. First we are asked to consider two masses that are placed three centimeters apart. The gravitational force between them is then measured. We don't know what it is, but let's call it F. Now those masses are moved closer together so that they are only one centimeter apart. And the question is, how does the gravitational force change? Well, to figure that out, we need to figure out how the distance changed. We know the distance changed, but how did it change? Was it multiplied by a number or divided by a number? That's what ...