Newton's laws predict the motion of most objects.
Motion and Forces
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When forces are balanced, no acceleration occurs; thus an object continues to move at a constant speed or stays at rest.
The law F = ma is used to solve motion problems that involve constant forces.
When one object exerts a force on a second object, the second object always exerts a force of equal magnitude and in the opposite direction.
Applying a force to an object perpendicular to the direction of its motion causes the object to change direction.
Circular motion requires the application of a constant force directed toward the center of the circle.