# Horizontal circle inside a cone

1. Mar 25, 2009

### blazeuofa

1. The problem statement, all variables and given/known data
A 3kg ball moves at constant speed in a horizontal circle on the inside of a cone. The radius of the circle is 2m. Determine the magnitude of the normal force acting on the ball and the time required for the ball to complete exactly one circle. Assume that the surface of the cone is frictionless. Use $$\theta$$= 60degrees. Hint: apply Newton's second law horizontally and vertically.

2. Relevant equations

Fc=mv^2/r

3. The attempt at a solution[/b

I have absolutely no idea where to begin any help is greatly appreciated!

2. Mar 25, 2009

### LowlyPion

Draw a diagram.

What direction is your centripetal force?
What direction is gravity?

Which components of these forces are acting normal to the surface of the cone?