Proving Negative G-Forces with an Example

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SUMMARY

The discussion focuses on calculating negative G-forces experienced by a stunt pilot during specific maneuvers. The pilot's mass is set at 70 kg, and the velocity is 60 m/s. Using the formula for centripetal acceleration, Fc = (mv²)/r, the calculated acceleration at a radius of 150 m results in 24 m/s², equating to approximately 2.4 Gs. The confusion arises from the interpretation of negative Gs, as the calculations yield positive values, indicating that the pilot experiences positive G-forces when traveling vertically downwards.

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BlueBiro
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Hi, nice forum. I was thinking how I would go about proving with an example, that negative Gs are occurring?

Homework Statement



Say a stunt pilot is doing a maneuver that will expose him to negative Gs. It could look like this:
[URL]http://upload.wikimedia.org/wikipedia/commons/5/57/Aeros_fig_englishbunt.svg[/URL]
Let his mass = 70kg and v = 60 m/s
These can be modified if you like

Homework Equations



Fc = (mv²)/r & F = ma

or ac = v²/r ?

The Attempt at a Solution



I was hoping to be able to finish with something like: if r > 1024m then he experiences -Gs but the answer is always positive. The only thing that could be -ive is velocity but it's squared. Am I attacking this wrong?
 
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It's not clear from your diagram what the direction of travel is.
 
He would be traveling from the point (the top).
Using the above velocity, with a radius of 150m, his accel would = 24 ms² ≈ 2.4 g's.
Would I be correct in saying that when he is travveling vertically downwards that would be 2.4 negative g's?
 

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