3-PS2-1: Balanced and Unbalanced Forces

Plan and conduct an investigation to provide evidence of the effects of balanced and unbalanced forces on the motion of an object. (Cause and Effect)

Clarification Statement: Examples could include an unbalanced force on one side of a ball can make it start moving; and, balanced forces pushing on a box from both sides will not produce any motion at all.

Assessment Boundary: Assessment is limited to one variable at a time: number, size, or direction of forces. Assessment does not include quantitative force size, only qualitative and relative. Assessment is limited to gravity being addressed as a force that pulls objects down.

Disciplinary Core Ideas
PS2.A: Forces and Motion

Crosscutting Concepts
Cause and Effect


The following assessments were created by science teachers hoping to better understand the NGSS. In most cases teachers went from standard to assessment in around an hour.  These are drafts and should be used accordingly. Feel free to improve these assessments or contribute to the collection. Learn more about assessment design here.



Anchor Charts



Forces (e.g. number, size, direction)
 - Balanced
 - Unbalanced
Motion (e.g. starting, stopping, or changing direction)
Cause and Effect

Learning Plans

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