f990dc30_ion__and_Energy__Build_a_Blimp__Explain
[Steps] If students let go of the blimp, it will probably rise into the air. Provide students with large and small paper clips. Students will add paper clips until their blimp hovers. Students will know they are successful when the blimp hovers for at least five seconds before slowly sinking close to the floor or rising close to the ceiling. Even if the blimp eventually moves close to the ceiling or floor, it can still be considered as hovering. [Explain] 
If students let go, the balloons will probably rise into the air. Ask: What can you do to make your blimp hover like an actual blimp? Students should suggest adding weight. Demonstrate how they can unfold and hook paper clips to the frame. Add paper clips until your blimp hovers. You will know you are successful when the blimp hovers for at least five seconds.
Force, Motion, and Energy: Build a Blimp
Explain