Great STEM project - create a wind (breath!)-propelled car. My 4th graders loved creating these!
12+ Transportation Themed Homemade Toys
12+ Transportation Themed Homemade Toys via Buggy and Buddy
teaching energy with bouncy balls
Making borax crystals
Borax crystals I made them with my students last year...super easy!
Inventing a Bouncy Ball Machine
Inventing a machine is a fun science activity for kids. This bouncy ball machine invented by 4 year old Aiden combines two simple machines, a lever and an inclined plane, to release bouncy balls on the ground.
Bouncy Balls You can use microphone to show balls bouncing to classroom noise level - from Vicki Lawhorn