## tension force

an astronaut in gravity free space is twirling a mass m on the end of a string of length R in a circle, with constant angular velocity. Write down Newtons second lasw in polar coordinates and find the tension of the string.

What makes up F(t) without acceleration and gravity? I'm confused.
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 Mentor Blog Entries: 1 There might not be gravity, but there's certainly acceleration. (Hint: Circular motion.)
 I see that the net force can be written as: F = F$$_{r}$$ $$\widehat{r}$$ + F$$_{\phi}$$ $$\widehat{\phi}$$ So I believe my tension force is just F$$_{r}$$ ? and N2L: F= m(F$$_{r}$$ $$\widehat{r}$$ + F$$_{\phi}$$ $$\widehat{\phi}$$) ? (for some reason my subscripts are appearing as superscripts)

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Blog Entries: 1

## tension force

 Quote by Oblio So I believe my tension force is just F$$_{r}$$ ?
OK. And since the angular velocity is constant, what's the tangential force?
 I found in my text that "F$$_{r}$$ would be the tension in the string and F$$_{\phi}$$ the force of air resistance retarding the stone in the tangential direction." Do I need to account for air resistance in the tension or is it simply F$$_{r}$$?
 ( On my computer anyways, subscripts are still appearing as superscripts, not sure why )
 Mentor Blog Entries: 1 They are in free space--no air, no air resistance. $$F_{r}$$ (F within tex brackets) versus F$$_{r}$$ (F outside of brackets)