Suction
Definition 1 of 3
Pro Tip 1/3
Physical Action
Suction as a force often involves a physical action that causes a vacuum. Using suction, the octopus attaches itself firmly to the rock.
Pro Tip 2/3
Not Always Visible
Suction happens even when you can't see the force, like in syringes or toilets. The plunger created suction that cleared the clog in the toilet.
Pro Tip 3/3
Common Misuse
Don't confuse 'suction' with 'adhesion'; suction involves vacuum force, not sticky surfaces. The gecko's feet use adhesion, not suction, to cling to surfaces.