A2 Physics Gravitational Forces past paper help

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krisshP
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The last part is what I don't understand and need help on please.

Part b starts by saying how tidal action causes the Moon to move further away from Earth. The MS answer to part biii, the last part of the question, mentions how close the Moon is the Earth determines the tidal action. They seem contradictory to me. What exactly is the cause and effect then?

Also, how did they make the jump between the last two points? How does greater/stronger tidal effects imply a greater rate of change of orbital radius? I feel so confused about this:confused:.

THANKS SO MUCH
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Stonebridge
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The closeness of the Moon causes the tides.
These tides cause the Moon to move away.
So the effect gets less as the Moon moves away.
The tides get smaller. The Moon still moves away but more slowly.

So the implication is a sort of exponential speed of movement away where it moves away quickly at first, but as the distance gets larger, it moves away more slowly.
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krisshP
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(Original post by Stonebridge)
The closeness of the Moon causes the tides.
These tides cause the Moon to move away.
So the effect gets less as the Moon moves away.
The tides get smaller. The Moon still moves away but more slowly.

So the implication is a sort of exponential speed of movement away where it moves away quickly at first, but as the distance gets larger, it moves away more slowly.
Aaj p,ay, makes sense. Thanks for helping.
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