# Tarzan swings

## Homework Statement

tarzan swings through the jungle on a wine.at the lowest point of his swing, is the tension in the vine greater than,less then, or equal to the gravitational force

## Homework Equations

its a conceptual question..

## The Attempt at a Solution

i say that the tension on the string is greater b/c.. the vine has to bring him up again..... not sure if im correct.... been a while since i delt with forces...

if... the gravitational for is more then the vine breaks..

if the gravitational for is equal to the tension the he comes to a halt

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anything wrong with my conclusion ?

PhanthomJay
Homework Helper
Gold Member
Yes, you're missing the concept of centripetal acceleration, which, for an object moving in a curved path, always acts inward toward the center of the curve (center of the circle in this case). What's the direction of the centripetal acceleartion at the bottom of the curve? What must be the direction of the net force at the bottom of the curve?

the "centripetal acceleration" is up and there is a tangential acceleration..so the tension on the vine must be greater then the gravitational force.....no?...

PhanthomJay
Homework Helper
Gold Member
That's right, the tension is greater. But at the bottom of the curve, there is no force in the x direction, so what is the tangential acceleration at the bottom? (that's an extra credit question).

no acceleration in the x-direction

thank you jay!

PhanthomJay