1. space travel 2 scientists use what they know about forces and motion 3 when they send rockets...
Post on 20-Jan-2016
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Space Travel
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Scientists use what they know about forces and motion
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when they send rockets into space
Gravity pulls things toward Earth
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In order to lift rockets into space,
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powerful engines are needed
The force of the rocket engines must be greater
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than the force of gravity which is
9.8 meters/second/second
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In that way the rockets can escape Earth’s powerful pull
Some rockets carry satellites
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Vocabulary:
satellites
an object that orbits, or moves around , Earth
Once a satellite is in space,
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the force from its engine balances the force from Earth’s
gravity
Then the satellite circles Earth
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the way the moon circles Earth
Some satellites are put into space to study the weather on
Earth
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Other satellites send radio and television signals around the
world
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Some rockets explore other planets a
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and their natural satellites, or moons
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