Four areas that should be addressed prior to the design and building phases include: student research on the history of the wheel, making sure they have an understanding of simple machines and basic science concepts, the opportunity to explore commercial model vehicles, and instruction in the use and safety of simple tools. Materials * 1cm x 1cm x 40cm basswood sticks 2 per vehicle * 3/16" x 16" hardwood dowels - 1 per vehicle * Assorted sizes medium density fiberboard wheels (1 1/4", 2", and 2 3/4" diameters) - 4 per vehicle * Right-triangle cardboard corners (gussets) * Craft sticks * Spacers (wood beads, straws, or plastic tubing) * White glue * Variety of classroom craft supplies Tools * Junior hacksaw * Bench vice * Hand drill with 1/4" bit * Drilling fixture * Reamer or file * Safety glasses * Hot/medium-heat glue gun and glue sticks * Ruler * Pencil * Ramp for testing Procedures * Determine measurements of vehicle. * Measure and cut four wood sticks for chassis. * Mark placement of axles on chassis. * Drill holes for axles. * Ream or file axle holes, so axles will turn smoothly. * Hot-glue the chassis together, using right-triangle cardboard gussets at each corner. * Cut two axles from dowels.
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