Discover forces and interactions with an engaging marble-run science investigation. Simple supplies and EASY PREP. Explore pushes, pulls, and collisions with a fun further exploration. Expand with an age-appropriate STEM Challenge. Includes extensive background information to guide the teacher and students to success. This is a printable PDF. Please read more about Easel below.Students will discover that a push or pull is needed for things to move. They will observe gravity and collisions in