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9 Space

Gravity and space flashcards

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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