Students revisit the sled that won’t go down the ramp, and invent a new way to “help” it move by modifying the sled.
Review of the sled problem:
Set up a ramp per pair of students. Attach felt or sandpaper to increase the friction. Set the ramp height so the sled cannot initially slide.
A new way to get it to move:
Provide card stock, weights, paper plates, spoons, washers, lids, aluminum foil, wax paper, paper fasteners, tape, paper clips. Ask:
Lead a discussion of the methods students used, and which ones worked. Introduce the words design, re-design and troubleshooting.
Further experimenting and recording results:
If students haven’t tried a variety of ideas, provide time for them to test their ideas, as well as others that students have come up with. Then ask students to record their findings on the worksheet.
Make a class chart to describe what happened as a group.
Provide two-gallon plastic bags for storing students’ sleds. Make sure each child’s name is written on his or her bag or sled.