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![]() In each of the above situations, there is an unbalanced force. Note that the actual magnitudes of the individual forces are indicated on the diagram. Free-body diagrams for three situations are shown below. The existence of an unbalanced force for a given situation can be quickly realized by looking at the free-body diagram for that situation. If either all the vertical forces (up and down) do not cancel each other and/or all horizontal forces do not cancel each other, then an unbalanced force exists. In the statement of Newton's first law, the unbalanced force refers to that force that does not become completely balanced (or canceled) by the other individual forces. ![]() An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force. ![]() If you have been reading through Lessons 1 and 2, then Newton's first law of motion ought to be thoroughly understood. |
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