The Physics of Tripping Scene: Home Alone 1
In case you've forgotten the scene (only need the first couple of seconds when Harry trips)....
When Harry trips over the string and falls he is displaying Newtons First Law: an object in motion tends to stay in motion. Harry is in motion as he is chasing after Kevin. When his leg comes into contact with the string it causes his leg to stop abruptly. However, his body still continues to move uniformly due to Newton's law and he topples over. So, he's not actually 'tripping" he is just continuing to move uniformly despite the rope stopping his leg.
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