I know a few boys that could spend all day doing this one!!! Totally doing this! For Kids, Catapult Games, Colors Catapult, Fun Games, Boys Games, Boys Boys, Rainy Days, Paper Plates, Crafts
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Build the catapult in different sizes, or with different rubber bands, or pencils of different length - discuss the changes each variable makes to the resultant motion of the projectile. Demonstrate circular motion and rotational KE. Based on the relevant principles, have the kids design and build other working models of catapults. Here are some ideas.