Clarification Statement - S.K.PS.2.1.CS:
Examples of pushes or pulls could include a string attached to an object being pulled, a person pushing an object, a person stopping a rolling ball, and two objects colliding and pushing on each other.

Assessment Boundary - S.K.PS.2.1.AB:
Assessment is limited to different relative strengths or different directions, but not both at the same time. Assessment does not include non-contact pushes or pulls such as those produced by magnets.

Science and Engineering Practices - PK2.SEP3.1:
With guidance, plan and conduct an investigation incollaboration with peers.

Disciplinary Core Ideas - S.K.PS.2.1.DCI:
PS2.A: Forces and Motion •Pushes and pulls can have different strengths and directions. •Pushing or pulling on an object can change the speed or direction of its motion and can start or stop it. PS2.B: Types of Interactions •When objects touch or collide, they push on one another and can change motion. PS3.C: Relationship Between Energy and Forces •(NYSED) A push or a pull may cause stationary objects to move, and a stronger push or pull in the same or opposite direction makes an object in motion speed up or slow down more quickly.

Crosscutting Concepts - CC2.1:
Simple tests can be designed to gather evidence to support or refute student ideas about causes.