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Orbital Motion, Natural And Artificial Satellites (physics Only) (GCSE Physics)

The following is a GCSE Physics test covering 'Orbital Motion, Natural And Artificial Satellites (physics Only)' from the broader topic Space Physics. The test is geared towards the AQA exam board style syllabus.
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Why do satellites in low Earth orbit (LEO) experience more atmospheric drag than satellites in higher orbits?
If the speed of a satellite in a circular orbit is reduced slightly, what happens to its path?
Why do GPS satellites require extremely accurate and stable clocks on board?
Why do astronauts feel weightless when orbiting Earth in the International Space Station?
In an elliptical orbit, where does a satellite move fastest?
Near Earth, how does the gravitational field strength g change as distance from Earth’s centre increases?
When launching a satellite into geostationary orbit from near the equator, why is it advantageous to launch eastward?
Which orbit is most commonly used for Earth observation satellites that need high spatial resolution?
Which factors determine the orbital period of a small satellite in circular orbit?
If the mass of a small satellite is doubled but it remains in the same circular orbit radius, what happens to its orbital speed?
A satellite transmits a signal to a receiver on Earth. If the satellite is moving toward the receiver, what happens to the received frequency due to the Doppler effect?