# Adding a mass on an oscillation causing a change in frequency

1. Aug 10, 2009

### kavipach

1. The problem statement, all variables and given/known data
A thin uniform rod of mass m is suspended from one end and oscillates with a frequency f.
If a small sphere of mass 2m is attached to the other end, does the frequency increase or decrease?

2. Relevant equations

3. The attempt at a solution
I have reached a conclusion that the frequency would decrease but im not sure exactly why. Is it because the amplitude would become bigger?

2. Aug 10, 2009

### diazona

No, it's not because of the amplitude.

Is this talking about a pendulum? What do you know about pendulums? Any formulas?

3. Aug 10, 2009

### kavipach

i know that pendulums work due to the concervation of energy but i dont understand how this could be about a pendulum.

4. Aug 10, 2009

### kavipach

Unless the P.E becomes greater when mass and since P.E=K.E, K.E becomes greater. But i dont understand how this would change the frequency.

5. Aug 10, 2009

### rock.freak667

What can you say about the period of a pendulum?

6. Aug 10, 2009

### Geezer

kavipach: What is the equation for frequency of a pendulum?

If you look closely, there are only two variables in that equation. Is mass one of them?