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Unicellular organisms
such as bacteria and protists are small objects that live in dense fluids.
As a result, the resistive force they feel is large and viscous. Since their
masses are small their motion looks very different from motion in a medium
with little resistance. Paramecia move by pushing their cilia (little hairs
on their surface) through the fluid. The fluid (of course) pushes back on
them. We will call this back force of the fluid on the cilia of the paramecium "the applied force", F (since it wouldn't happen if the paramecium didn't try to move its cilia).
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Page last modified November 6, 2004: D37