I've posted this demo on the site before, but now I have it in high definition. It's a classic experiment showing the principle of inertia in action. Watch the video!
Light can be absorbed, transmitted, reflected, refracted, and/or scattered. In this simple video, laser light is transmitted through glass, reflected off a mirror and refracted through a prism.
When studying light, students need to learn that visible light can be refracted into its different wavelengths. Of course it's ROYGBIV (red, orange, yellow, green, blue, indigo, and violet). A simple prism is usually used to do this, but I think there is a better way. Fill up a fish tank with water, put it in the sun, use a mirror and ta da a spectrum! Check out the video.
From the Science Outlet, I ordered some Jelly Marbles. I tried them out this past week, and I have to say they are pretty amazing. Check out the video of what they are and how they can be used in the classroom. You can also learn more on how to teach refraction, by viewing the laser lens eye demo that I did a couple of months ago.
How the heck do you teach the conservation of mass to 8th grade students? Lab activities are always good, but what lab activity can be done without the students getting super confused? Two components are required. First, a chemical reaction is needed. It must use simple chemicals, and it should be obvious that a chemical reaction took place. Second, it must be easily quantifiable. In other words the mass is easy to measure and it must show very clearly that mass was not lost during the chemical reaction. I think I may have finally developed a lab activity that addresses both components. Watch the video and download the student worksheet for more details.