Orbiting and Gravity: Why Do Astronauts Float?
Ages 6-1210-15 minutesEasy Difficulty
About This Activity
Learn how gravity and orbiting keep astronauts floating in space by using a simple experiment with a ball and string.
Materials Needed
- A small ball (like a ping pong ball or tennis ball)
- A piece of string (about 2 feet long)
Safety Notes
- Make sure you have enough space to swing the ball safely.
- Do not swing the ball near fragile objects or other people.
Instructions
- Tie one end of the string to the ball securely.
- Hold the other end of the string and swing the ball in a circle.
- Observe how the ball stays in motion, just like a spaceship orbits Earth.
- Now, let go of the string and watch what happens. The ball flies away in a straight line, showing what would happen if gravity stopped pulling objects into orbit.
How It Works
Astronauts float because they are orbiting Earth. They are actually falling, but because their spacecraft is moving so fast, they continuously miss the ground. This creates the feeling of weightlessness, even though gravity is still acting on them.
Tips for Success
- Try using different string lengths and observe how it affects the motion.
- Experiment with different ball sizes to see how mass changes the motion.
- Watch real astronaut videos and compare their movement to what you see in your experiment.