What is friction? Definition of friction
Definition of friction: Hands rubbing together is a kind of friction Definition of friction Friction is what happens when any two things rub against each other. These can be solid [...]
Definition of friction: Hands rubbing together is a kind of friction Definition of friction Friction is what happens when any two things rub against each other. These can be solid [...]
Photons - Sunshine breaking through the clouds. When did the first photons appear? A photon is a tiny little particle of light, far too small to see individually. All light is [...]
Emilie du Chatelet, a French philosopher in the 1700s Did Emilie du Chatelet go to school? Emilie du Chatelet's rich father, who was interested in literature and science, hired tutors [...]
Kids eating food (thanks to USDA) - get ready to digest food! How do you digest food? When animals, including people like you, digest their food, they use an oxidation reaction to [...]
Bending a nail You can do an experiment to see that metal bends easily. Just take an iron nail and hit it with a hammer and if you don't hit it [...]
Diagram of an iron atom The protons inside the nucleus of an atom all have a positive electrical charge, so they push away from each other. But the strong nuclear [...]
Swimming in natural hot springs in Iceland When water gets very hot, it boils and turns into steam. This happens at 212 degrees Fahrenheit or 100 degrees Celsius. The water [...]
A diagram of a hydrogen atom Hydrogen is the simplest kind of atom Hydrogen is the simplest kind of atom, and in the very earliest days after the Big Bang [...]
What is heat? A big campfire throws some serious heat Definition of heat When molecules of any kind of atoms get more energy in them than they had before, they [...]
Children playing a running game: a heat project Friction makes things hot You can easily make things hotter than they were before. Start by rubbing your hands together, and you'll [...]