In this lesson, we are going to introduce the students to the idea of weightlessness. There are two major take-aways: 1. When something is in orbit, it makes a circular path around earth because Earth's gravity is pulling it; 2. Astronauts seem to float in a space shuttle because they are falling at the same speed as the space shuttle; To explore the idea, we are going to have four activities: 1. Introduction and Solar System Demo. We will introduce the terminologies; 2. Mini-activity: Orbits. Further introduce the idea of the orbit of Earth; 3. Main-activity: Astronauts. Demonstrate if the astronauts are floating or falling; 4. Extension: Living with Weightlessness.
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