Friction Demo with a meterstick
The basic idea is that you support a meter stick horizontally with two fingers. Slide your fingers in and they will both meet at the center of mass. Here is a video.
View ArticleBalancing sticks – choose a longer stick
Maybe you have seen this trick. Basically, you hold by supporting it with two fingers from the bottom. You then move your hand around to keep it balanced while the stick is vertical. It is really not ...
View ArticleMoment of Inertia Demo
Moment of inertia is different than mass, but I like to call it the "rotational mass". What does mass do? Things with larger mass are more difficult to change their motion (translational motion). A...
View ArticleA surprisingly fun demo
This one is quite fun to do even in a class. The basic idea is to take a bucket of water and swing it around in a circle over your head. Simple, but if you have never done ...
View ArticleDemo: How to not spill your drinks
I think the simplest explanation is that the drinks do not spill because the string can only pull in the direction of the standing glasses. A slightly better explanation is that the string lets the...
View ArticleHow much of yourself can you see in a mirror
How much of yourself could you see in a small mirror?
View ArticlePressure demo: suction
How does a suction cup work? It is all about the atmosphere. Here is a demo. Take some type of "suction cup" device. In this case, I used a toy dart. Stick it to something ...
View ArticleDiver in a bottle
Basically, you put some floating object that has an air space in a closed bottle of water. When you squeeze it, the diver goes down.
View ArticleSurface Tension vs. Floating
So, that is just plain water. If I am careful, I can make that thin aluminum disk stay on the surface of the water. This is not the same as floating in Archimedes principle. It is different. ...
View ArticleKids like demos
Sometimes I get asked to do some demos for kids. I like this, it is fun. This week, I was asked to do just such a demo. Kind of as a historical record, I am going to ...
View ArticleMore Dangerous Kids
So, he lifted the car - it maybe be difficult to tell, but he did. HE LIFTED THE CAR! Ok, I know, he only lifted part of the car. If I were to use this in a ...
View ArticleWhat is this #2: Answer
I am still giving Fruity the credit for the answer "Ampere's Rule Apparatus", but clearly The Tome of Knowing says "Mounted Conductor (Ampere's Law Stand)". Basically, you run some current through this...
View ArticleWhat the heck is this answer 3
It is of course a gas discharge tube. You put these tubes in there (as shown above) with helium or neon or whatever in there and it excites the gas to give off light
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