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Name: j middle school
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Age: N/A
Location: N/A
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Date: Around 1993


Question:
How do space ships get off the ground?



Replies:
Gravity pulls on any object near the earth, including you, and a spaceship. To get off the ground, you have to push yourself up harder than the earth is pulling you down. When you jump in the air, you are pushing against the ground. When a bird flies, it is pushing against the air with its wings. A spaceship (or rocket) pushes against its exhaust - the stuff that comes out the back. Just as if you were sitting on a swing and threw a baseball forward, you would move backwards. The harder you throw the baseball, the more you will move. In the same way a rocket throws hot gasses out the back and pushes itself forward. If it pushes hard enough, it "blasts off". If it keeps pushing hard enough, it keeps going higher.

daniel n koury jr


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