Rockets and Astronauts

How do rockets fly to space and how do astronauts train?

Check your understanding

1. What scientific law explains why a rocket moves upward when gas pushes downward?
- A. Newton's First Law of Motion
- B. Newton's Second Law of Motion
- C. Newton's Third Law of Motion
- D. The Law of Gravity
2. Why do rockets shed parts called 'stages' during their flight?
- A. To make the rocket look cooler
- B. To become lighter and more efficient
- C. Because they run out of paint
- D. To collect trash from space
3. Why do astronauts train in a giant swimming pool?
- A. To learn how to swim in space
- B. To practice cleaning the space station
- C. To experience neutral buoyancy like they will in space
- D. To stay cool during hot weather
4. What is the main reason astronauts must exercise every day in space?
- A. To keep their muscles and bones strong
- B. To pass the time while orbiting
- C. To practice for running marathons
- D. To stay warm in the cold spacecraft

1. If you were on a spaceship that stopped moving, what would happen to gravity?
- A. Gravity would disappear completely
- B. You would start floating away into deep space
- C. Gravity would still exist, pulling everything toward Earth
- D. Everything would instantly fall to the ceiling
2. Why would it be dangerous for a sandwich to have loose crumbs in a spacecraft?
- A. They make the ship look messy
- B. Crumbs could float into someone's eye or damage the computer equipment
- C. The ship's gravity would pull them into the vents
- D. They attract space animals
3. What is the primary difference between a rocket and a jet engine?
- A. Rockets are much smaller than jets
- B. Rockets only use solar power
- C. Rockets carry their own oxygen, while jets use air from the sky
- D. Jets are made for space, but rockets are made for Earth
4. Why is it cheaper for private companies like SpaceX to build reusable rockets?
- A. Because they do not need to carry fuel
- B. Because they recover the rocket instead of throwing it away after one flight
- C. Because they are built in space instead of on Earth
- D. Because they use cheaper materials for construction

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