# Finding Tension when Mass Accelerates

1. Oct 21, 2009

### allielove13

1. The problem statement, all variables and given/known data
A mass of .500 kg is resting on the ground. Attached is a cord that makes a 30-degree angle with the horizontal. It is found that when the cord is pulled tight enough, the mass will skip along the ground without friction. How much tension is in the cord?

2. Relevant equations
F=ma?
T-Fg=ma?

3. The attempt at a solution
I have no idea how to start this..

2. Oct 21, 2009

### kellenm

Start with the sum of forces in the x and y direction.

3. Oct 21, 2009

### allielove13

So $$\Sigma$$Fx=Tcos30
and $$\Sigma$$Fy=Tsin30-Fg
?

4. Oct 21, 2009

### kellenm

Yeah thats right. Is this at a constant speed? Meaning no acceleration?