
This weekend, I taught my aunty the phenomenons of elevators. When the elevator door closed for the first time, and started up, I said "Our weight is exceeding the normal force." After my aunty gave a long and confusing stare, I explained that the equation for net force is mass times acceleration. Because our mass never changes, when the elevator accelerates, there is a net force. Accelerating up and decelerating on the way down, make you feel heavier because the force your weight imposes on the earth is greater than the normal force, or the force the elevator imposes onto you. When slowing down on the way up, or acceleration on the way down, you feel lighter because the normal force exceeds your weight, which is constant. I also explained that after the initial acceleration, the elevator moves at a constant velocity, with no acceleration, which is why in good elevators, it feels as if you aren't even moving.
I entertained my aunty by using my hands as vectors to illustrate the difference between the normal force and weight during our rides in the elevator. She was so amused that we rode it up and down three times before other people got on and gave us weird looks. Then, we figured that it was time to get off.
1 comment:
Love it!, Nikki! You are on your way to becoming an ambassador of physics! Educate the world!
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