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# Parametric equations Watch

1. This is a hard question.
Find the the coordinates of the point P which is the fixed point on the circumference of a circle of radius as it is rolled along the x axis.
Assume that point P passes through the origin.
Anyone got any ideas.
2. (Original post by Ano123)
This is a hard question.
Find the the coordinates of the point P which is the fixed point on the circumference of a circle of radius as it is rolled along the x axis.
Assume that point P passes through the origin.
Anyone got any ideas.
Just look up the cycloid, I'm assuming that's what you mean. https://en.wikipedia.org/wiki/Cycloid
3. (Original post by Ano123)
This is a hard question.
Find the the coordinates of the point P which is the fixed point on the circumference of a circle of radius as it is rolled along the x axis.
Assume that point P passes through the origin.
Anyone got any ideas.
Not that hard.
Define some angles and your done.

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4. (Original post by physicsmaths)
Not that hard.
Define some angles and your done.

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What about for a cardioid? It seems more difficult.
5. (Original post by Ano123)
What about for a cardioid? It seems more difficult.
Yh hat is harder. Lemme have a think.
Is the cardiod rolling such that contact with pisitive x yeh.

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6. (Original post by Ano123)
This is a hard question.
Find the the coordinates of the point P which is the fixed point on the circumference of a circle of radius as it is rolled along the x axis.
Assume that point P passes through the origin.
Anyone got any ideas.
I do not remember doing anything like this at A level

This might help for anyone who wants to try.

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