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June 13th, 2018, 11:47 PM   #1
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To clear the confusion between energy and power

Hi everyone,
for those interested, here is a video clearly explaining the often confusing difference between energy and power. Some people seem to like this format of videos, some not, please let me know if you have any comment.
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June 14th, 2018, 04:51 PM   #2
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I am not qualified to comment on physics, but

$(J/S = W (\text {watts})$ should be $(J/S) = W, \text { where } W \text { is watts.}$
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June 15th, 2018, 04:04 AM   #3
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It's not a bad video to be honest. At that sort of level, there's no need to worry about fine details.

Just some suggestions:
- The typing noise hurts my ears. I'm also not a fan of ALL CAPS and letter-by-letter typing. I'd prefer the sentence to just appear and then have a bit of time to read it.
- You might want to write the equation "Power = energy / time" at some point, since it's the definition of power.

I've also never encountered anybody who has confused power and energy. If you're looking for inspiration, you might want to make videos on (if you haven't already) on free-body diagrams, vector addition of forces, friction and multi-stage motion problems (a classic one is jumping out of an aeroplane and opening a parachute). Those were the sorts of problems I encountered most when I was a tutor because students often struggled with those.

Last edited by Benit13; June 15th, 2018 at 04:11 AM.
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June 15th, 2018, 09:08 PM   #4
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Quote:
Originally Posted by Benit13 View Post
It's not a bad video to be honest. At that sort of level, there's no need to worry about fine details.

Just some suggestions:
- The typing noise hurts my ears. I'm also not a fan of ALL CAPS and letter-by-letter typing. I'd prefer the sentence to just appear and then have a bit of time to read it.
- You might want to write the equation "Power = energy / time" at some point, since it's the definition of power.

I've also never encountered anybody who has confused power and energy. If you're looking for inspiration, you might want to make videos on (if you haven't already) on free-body diagrams, vector addition of forces, friction and multi-stage motion problems (a classic one is jumping out of an aeroplane and opening a parachute). Those were the sorts of problems I encountered most when I was a tutor because students often struggled with those.
Thank you for the useful feedback. The typing sound can indeed be annoying especially because it doesn't have much randomness as the real sound would. Some part of the text appears as a whole instead; making good videos takes time and there is a long learning curve. As for the topics you suggested, they are indeed interesting, I already have several lessons on vectors on the channel.
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June 15th, 2018, 09:16 PM   #5
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Quote:
Originally Posted by JeffM1 View Post
I am not qualified to comment on physics, but

$(J/S = W (\text {watts})$ should be $(J/S) = W, \text { where } W \text { is watts.}$
Thank you, there is always room for improvement.

Last edited by skipjack; June 16th, 2018 at 12:22 AM.
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June 16th, 2018, 12:43 AM   #6
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Each box moved up with constant velocity, which implies constant kinetic energy, then stopped when it reached a certain height. What happened to the kinetic energy?
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June 16th, 2018, 08:56 PM   #7
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Quote:
Originally Posted by skipjack View Post
Each box moved up with constant velocity, which implies constant kinetic energy, then stopped when it reached a certain height. What happened to the kinetic energy?
That's an interesting question. In the video I wanted to keep things simple and focus on energy and power. At the very end of the motion there is a net negative work done by gravity, hence a decrease in kinetic energy.
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