Above It All

1		Why is there a lack of resistance in the operation of a maglev train? Why is this lack of resistance important?
2		Why is the operation of a maglev train attractive for both short and long distances?

A Bicycle Racer's Edge

3		What factors are related to air resistance in bicycle racing?
4		Why does forming a single file line help cyclists fight air resistance?
5		Describe at least three things cyclists can do to reduce the forces that resist their motion.

Free Fall

6		In physics, what is the meaning of free fall?
7		Why does diving or "standing up" during freefall affect a diver's free fall speed?

Space Station Weightlessness

8		Why is it incorrect to state that astronauts experience zero gravity while orbiting the earth?
9		Why do astronauts in orbit appear to be weightless if they continue to experience the earth's gravitational attraction?
10		What are the health consequences of prolonged real or apparent weightlessness on the human body?