Students construct SunEzoon Cars and on a sunny day take them outside to a flat, smooth surface. Students use a three-meter circle on the surface. The circle is marked at the north, south, east, and west points, as well as the other 12 compass points: NNE, NE, ENE, ESE, SE, SSE, SSW, SW, WSW, WNW, NW, and NNW.
Students work in pairs, with one timing and the other releasing the solar car so it runs across the circle toward the corresponding mark on the opposite side of the circle. The timing is stopped when the car reaches the opposite side of the circle.
Times are collected for all 16 starting points. Students record times and observations and discuss the results.