# Twirling a mass on a string

1. Jul 12, 2008

### Mattowander

Hello! I'm very new to these forums so please pardon my ignorance.

When you twirl a mass on a string horizontally (I.E. you hold a string with a mass on the end of it and spin around) , what is the force keeping the mass from falling due to gravity? I'm a little curious and I can't seem to understand this. I'd appreciate any insight. Thanks!

2. Jul 12, 2008

### cabraham

Tension.

3. Jul 12, 2008

### Mattowander

I thought the tension acted perp. to the object's weight?

4. Jul 12, 2008

### stewartcs

The vertical component of tension.

CS

5. Jul 12, 2008

### Mattowander

Ah alright thank you! :)

6. Jul 13, 2008

### NoobixCube

The mass will never be travelling in a completely horizontal path, there will be a finite vertical component as mentioned above to oppose the force from gravity

7. Jul 14, 2008

### Staff: Mentor

I think you meant to say that the string will never be completely horizontal--thus there will always be a vertical component of tension to balance the weight. (The mass can certainly travel in a perfectly horizontal path.)