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Understand concepts through examples and problems contributed by a community of mathematicians, scientists, and engineers.

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From practical knowledge, we expect things that weigh less to accelerate more quickly than objects which weigh more, when we apply the same force F.

Think of what would happen if we use the jet engine of a plane to propel a cruise ship. Although we're providing a lot of thrust, we don't expect the ship to accelerate very quickly because of how heavy it is. Now, think of using the jet engine to propel a waiter to your table... actually, you can just watch:

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