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# HSC Physics | Space

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Quiz by asensio10
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Last updated: October 28, 2017
 First submitted October 28, 2017 Times taken 29
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 Hint Answer Amount of matter in an object Mass Energy Stored to it's position in a gravitational field Gravitational Potential Energy Once it is launched, only force that acts on it is acceleration due to gravity Projectile Force Experienced due to gravitational acceleration G Force Type of orbit if satellite has period of <24 hours Low Earth Time Taken for Satellite to complete one orbit Period What Satellite experiences when it makes friction with atmosphere Orbital Decay Effect utilised by probes using a planet's gravity to speed up or slow down Slingshot Effect
 Hint Answer Phenomenon that supposedly allowed light to be transmitted Aether Disproved by this experiment, turning up a null result Michelson-Morley Experiment This theory of Einstein's support these results Special Relativity Anything to which we describe motions and take measurements Frame of Reference This is constant regardless of THE ABOVE CONCEPT of observer Speed of Light Type of Experiment Einstein used to test this Thought This theory proved three concepts not to be constants, name one other than mass Time or Length
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level 58
Oct 28, 2017
Some corrections: the force experienced due to gravitational acceleration is weight, not g-force. The Michelson-Morley experiment did not disprove the existence of the aether but rather placed the upper limit of the relative velocity of the aether at around 4-8 km/s, much lower than expected. Also, reference frame should be accepted and in the second hint it should be "its" instead of "it's".
+1
level 41
Oct 28, 2017
How would you define G force then?
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level 58
Oct 28, 2017
g-force is more of an effect during free-fall that gives the perception of weight. In fact, despite the name, it's a measure of acceleration rather than force. In short, g-force is the acceleration of an object relative to free-fall.
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