Khan Academy Static

4A: It’s gym day. Today you are going to run, swim, and lift weights. In physics terms, we can describe these actions in terms of vectors and scalars. For instance, if you throw a discus across a field with a 20-pound force westward, that is an example of a vector: an entity with both magnitude and direction. However, when you show off about how many laps you can swim in an hour, you are referring to speed, a scalar, which does not specify direction. An understanding of vectors and scalar will provide a foundation to many of the other basic concepts in physics.

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