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# circular motion Watch

1. Can anyone give me a hint for this question? I have used KE and forces to find 2 equations, but these involve a value of v, r and theta, and I'm not sure how to remove one of these variables.
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2. (Original post by pippabethan)
Can anyone give me a hint for this question? I have used KE and forces to find 2 equations, but these involve a value of v, r and theta, and I'm not sure how to remove one of these variables.
If the car is not going to leave the track, the last point in its motion where it might do that is at the very top. So, choose theta accordingly.

Alternatively, post what you've done so far - it's possible you may be able to do something with radial force must always be away from the centre.
3. (Original post by ghostwalker)
If the car is not going to leave the track, the last point in its motion where it might do that is at the very top. So, choose theta accordingly.

Alternatively, post what you've done so far - it's possible you may be able to do something with radial force must always be away from the centre.
Thank you! I've got it now - the angle from vertical would have to be zero, and I can work out r from there. Thank you
4. you're welcome

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