# Homework Help: Verical and Horizontal Circles

1. Oct 10, 2007

### shaheen

This is a general question and one that I cannot get an answer for.

What is the difference between the 2?

How do they alter how we approach to solve a problem for each type?

Answers kindly welcomed

2. Oct 10, 2007

### Staff: Mentor

There must be more to this question. A circle is a circle. Can you please be more specific in your question?

Welcome to the PF, BTW.

3. Oct 10, 2007

### shaheen

thanks for the welcome

this doesnt relate (as yet) to a specific mechanics/physics question - I have just come across the terminology whilst doing some reading and wasnt quite sure what they meant by vertical and horizontal circles.

I mean - a circle is a circle but what differntiates a vertical circle from a horizontal one?

4. Oct 10, 2007

### CompuChip

The direction of your axes?

5. Oct 10, 2007

### Staff: Mentor

Yeah, that's all I can think of without more information. The equations for the two different circles will be different, if they are in the same coordinate system.

x^2 + y^2 = R^2 for horizontal, centered on the origin and parallel to the x/y plane.

y^2 + z^2 = R^2 for vertical, centered on the origin and parallel to the y/z plane.

6. Oct 10, 2007

### shaheen

thanks for that, that makes sense

just off to tackle a question dealing with this: regarding motion in a vertical circle

looks easy enough

7. Oct 10, 2007

### Staff: Mentor

Well, now, hold on there. You didn't say anything before about motion in a gravitational field for horizontal and vertical circular paths. There's a big difference between those, right? What would be different about the motion along horizontal and vertical circular paths in a gravitational field?

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