I'm learning basic physics. I can't believe how little i knew. I've just found out the difference between weight and mass. My knowledge was that bad!
So i'm now reading about opposing forces. Apparently if you rest your elbow on a table there are both downwards and upwards forces. I imagine the downwards force is the weight of your arm due to the pull of gravity. However I have no idea what the upwards force might be. Any elabpration much appreciated.
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