For whole class:

• 8 clamps and stands
• 8 plywood sheets about 10 cm (4 in.) wide and 2 each of the following lengths: 30 cm, 60 cm, 90 cm, and 120 cm.

Each group needs:

• spring scale
• meter stick
• small car (i.e., rolling toy) with a string attached
• weight (same size for each group)
• 4 copies of the Inclined Plane Worksheet