PS3+(5-6)+-+8


 * Students demonstrate an understanding of motion by…**

8a using data or graphs to compare the relative speed of objects.


 * Students demonstrate an understanding of force (e.g., friction, gravitational, magnetic) by…**

__8b recognizing that a force is a push or a pull.__

__8c explaining that changes in speed or direction of motion are caused by forces.__

__8d showing that electric currents and magnets can exert a force on each other.__

What ideas to students need to understand before they can address the topics described above?
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