- #1

- 179

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- Homework Statement
- Consider a rotating rod with a mass attached to its end.

When does the rod produce a compression force and when a tension force?

- Relevant Equations
- ##\hat n) F_n=mr\omega^2##

Hi

I'm having trouble to understand the centripetal force in a rotating rod with a mass in its end.

When ##90°<\theta<270°##, the centripetal acceleration is produced by the tension, which counteracts the radial component of the weight.

But what happens when ##\theta<90°## or ##\theta>270°##? There's no tension because the force (weight) is towards the centre, so the weight causes the centripetal acceleration. Right?

As the rod is rigid, I think that, for some interval of ##\theta##, the rod produces a force that acts as a tension force and for other interval it acts as a compression force. Would this interval be compression for ##\theta<90°## and tension for ##90°<\theta<270°##?

Then, in the case of a string instead of the rod, the centripetal acceleration is produced by the tension and when ##\theta<90°## it is produced by the weight.

I'm having trouble to understand the centripetal force in a rotating rod with a mass in its end.

When ##90°<\theta<270°##, the centripetal acceleration is produced by the tension, which counteracts the radial component of the weight.

But what happens when ##\theta<90°## or ##\theta>270°##? There's no tension because the force (weight) is towards the centre, so the weight causes the centripetal acceleration. Right?

As the rod is rigid, I think that, for some interval of ##\theta##, the rod produces a force that acts as a tension force and for other interval it acts as a compression force. Would this interval be compression for ##\theta<90°## and tension for ##90°<\theta<270°##?

Then, in the case of a string instead of the rod, the centripetal acceleration is produced by the tension and when ##\theta<90°## it is produced by the weight.