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No robot is too small to be tipped over. At Sacramento we tipped over quite a few robots and ALMOST tipped ourselves even though we have such a low center of gravity.
Most robots get tipped over when they are pushing up the ramp against another robot. Let's say the back wheels are spinning counter-clockwise when your robot is pushing up the ramp. If your robot isn't going anywhere, the force of moving the wheels needs to go somewhere. Usually your wheels will just spin, but with the robot at such an angle the force will cause the robot to pivot clockwise around the back wheel and you will tip. You will tip even faster with a high center of gravity, but low robots will tip as well.
Basically, if your robot starts to tip, stop pushing and reverse directions!
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