I think maybe it has to do with you giving too much force or something, but why do you end up being thrown back instead of if sort of balancing out when you realize it’s lighter than you thought?
In: Physics
What you don’t realize is that there is a lot of motion that goes into lifting something. It isn’t just hands or arms. It’s an entire shift of your body.
Your brain makes a judgement call and shifts such that the new weight you have picked up will balance you out.
If this new weight is lighter than expected, the shift is too much. Really, you threw yourself backward, so when the object isn’t heavy enough to balance you, it feels like someone pushed you back. But you did it to yourself.
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