While climbing the Empire State  Building, King Kong peaks into one of the corporate windows, and sees a poster with Tarzan swinging from a vine. Our furry friend decides he'd much rather be swinging from vines instead of hanging outside of skyscrapers When King Kong is swinging from a vine, what forces are acting on him? 

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The forces we discussed were 

1.gravity

2.normal

3.friction

4.push or pull 

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2. The overgrown gorilla is not in contact with any surface, so there is no normal force. 

3. Again, he is not in contact with any surface, so neither static friction

nor kinetic friction is exerted on him. 

4. No one or thing is pushing or pulling on King Kong (and who or what

would want to?), but there is a tension T in the vine holding him up. 

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Continue to: Example 4: The Elevator 
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