My coworker told me gravity isn’t a force it’s an effect mass has on space time, like falling into a hole or something. We’re not physicists, I don’t understand.
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Assume you are traveling through space. You pass by the earth and suddenly you feel like you are getting closer to it, even though you don’t feel like you are being pulled towards it at all.
This is because your body is still traveling in a straight line, at rest. What’s really happening is that the earth is so massive it makes a giant sinkhole in space, so your straight line has become a curve.
When you are standing on earth, the ground is actually pushing you away from it. This is the normal force. If you hold an uncalibrated accelerometer in your hand, it would show -9.8m/s because your hand is pushing it away from the straight line path that leads straight down.
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