Have you ever wondered whether or not ketchup was considered a liquid or a solid. After all it can take a lot to get ketchup out of a bottle. Sometimes you have to shake and squeeze really hard and then it all come squirting out. Well in this TEDEd video they will explore the science behind ketchup and other similar substances' viscosity.
This animated video does a great job of talking about the relativity of speed. This would be an excellent video to show during a physics or astronomy lesson on traveling through space.
Steve Spangler demonstrates the power behind friction using two notebooks. This can also be done using your textbooks. Variable to the experiment is to test the strength of the friction after 1, 5, 10, 20, and 40 overlapped pages.
This video discusses and demonstrates how levers are used to reduce the amount of work and energy required to lift something. This would be great to show your students during a lesson on levers in your physics classroom. Archimedes's work and experiments are discussed as well.
This science lab can be used in any of the science disciplines because it is going to help students learn how to read a meter tape. Students will learn what the Magnus Effect is and how to demonstrate the Magnus Effect by "flying" a hollowed-out "Bic" pen across the classroom. Students will also learn how to create a spreadsheet and then add a formula that will automatically calculate the average of their pen flight distances. I use this lab at the beginning of the year to get students excited about science as well.