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Dot Physics

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Stop Motion Animations – for free

The first thing from AAPT that I would like to mention is SAM Animation that Brian Gravel demonstrated. SAM is free software that allows for the easy creation of stop motion animations. Basically, you use a web camera to take successive pictures and put them together as a movie. The software includes features (I think…

Physics of the Water Rocket

I said I would come back to this, and I am. I am a man of my word. Yesterday, I posted a link to a video of this really cool water rocket thingy. How does this work? What is the physics going on here? I think this can be best explained with the momentum principle.

I saw this on Hack a Day, but I am sure it has been posted in other places also (seems like something that would be on Swans on Tea). Check it out. Amazing New Water-Powered Jet Pack – Watch more free videos Some pretty cool stuff. I am pondering the questions to be answered right…

I really didn’t want to post this, but I am going to anyway. I used ScreenToaster.com to make a screen capture movie (with audio) of a tutorial on spreadsheets. This should accompany my previous post on numerical calculations. Free online screen recorder

Kobe Bryant Jumping Over a Car

We have all seen the Kobe Bryant video of him jumping over an Aston Martin – this keeps coming up on the Internet. There has been vast discussions of whether this is real or fake. I will do my best to examine the evidence. In short (in case you don’t want to read the whole…

When is the Sun directly overhead?

Question: When is the Sun directly overhead? (assume you are in the United States of America) Common Answers: Everyday at noon. On the summer solstice (June 21ish) Answer: For continental U.S. the answer is never. Since the Earth’s rotation axis is tilted 23.5 degrees with respect to its orbital motion around the Sun, one would…

I’m Iron Man. (no, I’m not)

I finally saw the movie Iron Man. It was good. I feel that I am qualified to evaluate the movie. When I was in high school, I was totally into comic books. Mostly Spider-man, but I still have a significant collection of Iron Man comics. Ok, now you know I am not an Iron Man…

I saw this video on several places. It shows an astronaut playing with a CD player. I wish I were an astronaut. I would probably not stop throwing up though. It would still be worth it. You can only throw up so much right? (I know the answer to this question). Anyway, this is a…

Here is the video in question: Looks too incredible to be real for me. That is when I start to question things. Is this fake or not? To answer this, I took a clip that showed a person launching a grocery item over the isle. This was a good shot to look at because it…