Forces and Motion
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Motion and changes in motion can be quantitatively described using concepts of speed, velocity, and acceleration (including speeding up, slowing down, and/or changing direction).
Newton’s second law of motion (F=ma) and the conservation of momentum can be used to predict changes in the motion of macroscopic objects.
If a system interacts with objects outside itself, the total momentum of the system can change; however, any such change is balanced by changes in the momentum of objects outside the system.