Note: This lesson is part of this unit’s Anchor Layer. If you have the Anchor Layer turned on, we recommend teaching all of the lessons in this unit in order.

The anchor phenomena for this unit are barges! Student investigate how pushes and pulls affect the motion of barges, and how other machines allow us to use barges to move huge amounts of objects.

During the introduction, students generate observations and questions about the phenomenon and create a list of possible explanations for the phenomenon.

Students will gather clues during and after each lesson in this unit to help them improve their understanding and explanations. It is important to encourage students to recognize that even if they don't know the perfect answer yet, they are going to learn a lot throughout the unit and will have an opportunity to revisit the phenomenon over time.