In Lesson 4, students use observations from Lesson 3 to develop and revise models (SEP.2) to describe that light reflecting from objects and entering the eyes (PS4.B) allows objects to be seen (CC.2).

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

In Lesson 21, students apply their understanding of magnetic force to explain another force that can act over a distance— electric force. They also update the anchor chart and apply their new ...