# Homework Help: Swing system

1. Aug 30, 2011

### jeff1982

1. The problem statement, all variables and given/known data
Your nephew Albert sits on a lightweight swing. Albert has a mass m. You pull horizontally on Albert so that the swing rope of length L maintains an angle $\theta$
with the vertical

2. Relevant equations
A. Write a newton's 2nd law equations for the horizontal force components acting on the system.
B. Write a Newton's 2nd law equation for the vertical force components acting on the system.
C. Derive an expression that would allow you to calculate the value of F if you were given m, g, L, and $\theta$

3. The attempt at a solution A. F=ma, B. F=mg. C. no clue

2. Aug 30, 2011

### rock.freak667

Start by drawing the free body diagram with the mass at the angle. Then try splitting the weights into 2 components, one in the direction of the string and one tangential to the mass.