Review the Engineering Design Process with students using the EDP poster.

Given a 3-view drawing of a second cradle, students will create a 2D net and assemble it.

On the Backwards Ramp student sheet is a 3-View drawing of a ramp shape that can be used as a cradle for the catapult.  In the space provided on the student sheet, students should try to sketch a 2D net of this cradle. 

A possible solution is provided below.

When they are on the right track, give them large index cards.   The design does not have to be entirely in one piece, but the 2D net of this object can be implemented in one piece.  Challenge them to do that.

When they have a design that they think will work, they should cut it out and assemble the 3D structure.

• • If at first they don’t succeed in creating the correct structure, have them reflect on which parts were incorrect and try again.  Iteration is part of the design process.

  • Students should label their ramp cradle with their name, and store in a safe spot for later testing.

Recap from yesterday—issues drawing the cone shape.

Have students describe any challenges with making the 2D net for the cradle and how they overcame them.