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Answer:
1. A force is an influence that can cause an object to change its velocity, i.e., to accelerate, meaning a change in speed or direction, unless counterbalanced by other forces. The concept of force makes the everyday notion of pushing or pulling mathematically precise. Because the magnitude and direction of a force are both important, force is a vector quantity. The SI unit of force is the newton (N), and force is often represented by the symbol F.[1]
2. Balanced forces are forces of equal magnitude but are opposite in direction. Objects acted upon by balanced forces remain at rest or stay in motion at a constant speed. Unbalanced forces, on the other hand, are not equal in magnitude and may or may not be directed in the same direction.
3.Law of Inertia, Law of Mass and Acceleration, and the Third Law of Motion