Lesson Summary Using two balls of different sizes children focus on the effect that size has on how quickly a ball reaches the bottom of a ramp and far it goes after it leaves the ramp.  They observe, measure, and record their results. Teacher Background Focus student learning on the effect the size of a ball has when it moves down the ramp. Set-up/Management Tips Copy science notebook page and Home-School Worksheet.  (optional) Put out materials in an easily accessible manner for all students. Class chart from previous learning experience. Literacy Support Scientific Vocabulary The following words are key vocabulary words that will be introduced in this lesson and reinforced throughout the unit: No New Vocabulary introduced in this Lesson