Summary
Introduces escape velocity — the speed an object must reach to break free of Earth's gravity — and explains why rockets must go so fast. A great bridge between the gravity episodes and space exploration.
Viewer safety
All ages
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Teaching resources
Discussion questions
Discussion
- What is escape velocity? Why does it exist?
- Would the escape velocity be higher or lower on a planet with less mass than Earth? Why?
- If you throw a ball up, gravity slows it. Why doesn't a rocket eventually slow to a stop and fall back?
- How did understanding gravity help humans plan space missions?
Quick work-a-long
Vocabulary: escape velocity, gravity, orbit, atmosphere, acceleration, thrust.
Try it: Toss a ball gently — gravity wins and it falls. Toss it harder — still falls, but farther. Draw a graph of 'throw speed' vs. 'how far it lands.' Where would 'escape velocity' appear on that graph?