The relationship between force and motion is described by Newton's laws of motion. Here’s how they apply to your statements:
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"An object cannot move unless it has enough magnitude." - This statement is somewhat misleading. An object can move if a force is applied, regardless of the force's magnitude, although the motion might not be noticeable if the force is very small compared to other forces acting on it (like friction).
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"An object will move faster if you leave it alone." - This statement is incorrect. An object will not move faster on its own if no net external force is applied to it. According to Newton's first law, an object at rest will stay at rest unless acted upon by a net external force, and an object in motion will continue in motion at a constant velocity unless acted upon by a net external force.
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"An object will only move if a lot of net force is applied to it." - This statement is not entirely accurate. An object will move with any net force applied to it, regardless of how small that force is, though the resulting acceleration (according to Newton's second law, \( F = ma \)) will be small if the force is small.
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"An object will move in the direction of the force that is applied to it." - This statement is correct. According to Newton's second law, the acceleration (and thus the change in motion) of an object is in the same direction as the net force acting on it.
In summary, the most accurate statement regarding the relationship between force and motion is that an object will move in the direction of the force that is applied to it.