Students know the position of an object can be described by locating it in relation to another object or to the background.
The motion of objects can be observed and measured. As a basis for understanding this concept:
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Plan and conduct an investigation to provide evidence of the effects of balanced and unbalanced forces on the motion of an object.
Plan and conduct an investigation to compare the effects of different strengths or different directions of pushes and pulls on the motion of an object.