What is this object called? It deals with Pressure.

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The object in question is identified as a suction cup, which demonstrates the principle of pressure. When the knob on the suction cup is turned, it creates a vacuum between the cup and the surface, significantly reducing pressure. This vacuum results in a downward force due to atmospheric pressure, while the upward force is minimal, making it difficult to remove the suction cup from the surface. The discussion confirms the understanding of how pressure dynamics work in this context. Overall, the mechanics of suction cups effectively illustrate the concept of pressure in physics.
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Hi. When I took AP Physics last year, my teacher demonstrated the power of pressure by this object. It looked like a lid. It was rubber. You put the lid on a wooden desk, turn the nod on top of the lid, and try pulling the lid off the desk without sliding the lid. I forgot the name of this object. Does anyone know what it's called?

I was thinking about it one night and I think I have the right concept. Correct me if I'm wrong.

When you turn the nod, everything between the wooden desk and top of the lid becomes a vacuum; thus, it has no pressure. When you draw a force diagram on the lid, there is a force acting down: F= P * A (neglecting the weight of the lid). There is no force acting up because there is barely any pressure. Therefore, it is extremely difficult to pull the lid off the table.

Is that correct?

Thanks in advance!
 
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