Force
Forces are vectors. That is, they are quantities that have both size and direction.
Forces can be symbolized with arrows, as can all vectors. The arrow
in the picture below is meant to show a force with the size of 15
Newtons directed toward the left.
An understanding of vectors is essential for an understanding of physics. A vector is a quantity that has two aspects. It has a size, or magnitude, and a direction. In contrast, there a quantities called scalars that have only size.
Vectors are usually drawn as arrows.
More than one force can act on an object at once. For example, two people could push on a book at the same time. One person could push toward the left and the other could push toward the right. In this case the two forces would act against each other.
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