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Newton 2 in fluids (essay)

Page history last edited by Joe Redish 8 years, 2 months ago

Consider the following conversation between two biology students.


Liz: I work in a microbiology lab and in our experiments we are often manipulating the
motion of objects suspended in a fluid. To get these objects to move at a constant speed,
we have to apply a force that is proportional to the velocity of the object.


Jack: That can’t be right. In physics, I learned that force is equal to the mass of the object
times the acceleration of the object.


Do you agree with Liz or Jack? Are the perspectives of these two students consistent or
contradictory? Note: This is an essay question. Your answer will be judged not solely on its
correctness, but for its depth, coherence, and clarity.

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