This spring break i went to Japan! in Japan, everybody uses trains and subways as their mode of transportation. Most of the time the trains are realllly crowded so you have to stand up and hold onto the handles (shown in the above picture). The reason why they have to hold on is all physics. Due to inertia, when the trains starts and stops, your body is wanting to either stay still or keep moving therefore your balance is thrown off. That is why you would need to hold onto something. Also, the trains in japan are powered electrically and magnetically.
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