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9 Space
Gravity and space flashcards
| Term | Definition |
|---|---|
| The force of attraction between any two objects. | gravity |
| The unit of force. | newton (N) |
| The amount of force with which gravity pulls something towards the Earth. It is measured in newtons (N). | weight |
| A satellite made by humans. | artificial satellite |
| A satellite used to transmit TV programmes or telephone calls. | communications satellite |
| A satellite used to take pictures of the Earth – for instance to help forecast the weather. | Earth observation satellite |
| Oval shaped. The shape of a planet’s orbit around the Sun. | elliptical |
| An orbit where a satellite takes exactly 24 hours to circle the Earth, so it always stays over the same part of the Earth. | geostationary orbit |
| A satellite that has not been made by humans. | natural satellite |
| An orbit where a satellite passes over the North and South Poles. It will pass over all parts of the Earth during several orbits. | polar orbit |
| Anything in orbit around a planet. | satellite |
| The unit used for measuring mass | kilograms |
| Rockets can only accelerate if this is greater than their weight. | Thrust force |
| The rate by which something increases in speed. | Acceleration |
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