News — HS-PS2-2

A 0.005 kg bullet can knock down a 5 kg block, and the math that explains it fits on a sticky note. That is the hook your students rarely get when conservation of momentum shows up as a wall of subscripts on the board. A good conservation of momentum activity does two things at once: it makes the "before equals after" rule feel obvious, and it forces students to commit to a prediction before they see the result. Below you'll find classroom-ready ways to teach conservation of momentum that work whether you have a full equipment cabinet or a box...