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How to Hoist Yourself Out of a Hole With Physics – ANITH
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# How to Hoist Yourself Out of a Hole With Physics

## How to Hoist Yourself Out of a Hole With Physics

No one can deny that there are some great physics videos out there in the wild internet. Today, I found this one floating around—featuring what appears to be a worker that needs to get out of a cone-shaped hole. Oh sure, he could possibly climb up the side or maybe even use a rope as an assist. But no. This guy studied his physics. He knows a great trick to get out of this hole—by running in circle. But how does it work?

### Climbing Up the Side

Suppose this was just an ordinary worker that tried to walk straight up the side of the hole. Of course there must be some force on him to prevent him from sliding back down the incline—that’s the frictional force. The frictional force is parallel to the surface of the hole, and its magnitude depends on two factors. The first is called the coefficient of static friction, which is normally represented by the variable μs. Depending on the two types of surfaces interacting, the coefficient will have a value between 0 and 1; the higher the value, the rougher the interaction. The second factor is the normal force: the force the surface exerts on the object that is perpendicular to the surface. If you have a flat surface with an object at rest, the surface pushes up with the same force as the gravitational force pulling down. However, as you move to a sloped surface, this value decreases. Overall, I can write the maximum frictional force as: