1. When an object at the start is at rest, the resultant force is zero the effect on the object it stays at rest
2. When an object at the start is moving, the resultant is moving the effect on the object is the velocity stays the same
3. When an object at the start is moving, the resultant force is non-zero in the same direction as the direction of motion of the object, the effect on the object is it accelerates
4. When an object at the start is moving, the resultant force is non-zero in the opposite direction to the direction of motion of the object, the effect on the object is it decelerates
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