Demonstrate and explain that colliding objects push each other and as a result, change each other's movement (speeding up, slowing down or changing direction).
Give examples of how it is harder to change the motion of a heavier object, it requires a larger push.
Experimenting with balls is fun! In this hands-on lesson, you and your students will make them collide and study how balls can push each-other and people too! While exploring, students will also feel how pushing a light ball is different from pushing a heavier ball. Weight is important.
This lesson fits well together with a lesson where students push balls to discover how people use pushes and pulls to change motion.
You can find this page online at: https://www.sciencebuddies.org/teacher-resources/lesson-plans/push-pull-weight
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