Snorkeler takes a syringe filled with 15 mL of air from the surface. where the pressure is 1.0 atm, to an unknown depth. Volume of the air in the syringe at this depth is 9.3 mL What is the pressure at this depth?

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It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on