English National Curriculum - Science Science
Mission Objectives
Describe the differences between planets, their moons and artificial satellites
Explain how in circular orbits the force of gravity can change the velocity of an object but not its speed
Explain how for a stable orbit the radius must change if the speed changes
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Words and meanings to learn
orbits
An object which follows a repeating path in space.
planet
A celestial body which orbits a star.
satellites
Any object that orbits either the Sun, Earth or another giant body.
artificial
Something which has been man-made instead of naturally occurring.
moon
A celestial body which orbits a planet.
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