Let the students act out the parts of the sun and the Earth. Have them demonstrate the rotation of the Earth and its revolution around the sun. Students can use colored styrofoam balls to construct a model of the solar system. Have the students choose a planet, research the planet, and then present this information to the other students. At this time, the students can make a living model of the solar system.
Students can use a spring scale to measure the gravitational pull or weight of several objects.
They can compare the gravitational pull and construct a chart of their results.