Clarification Statement - S.K.PS.2.2.CS:
Examples of problems requiring a solution could include having a marble or other object move a certain distance, follow a particular path, and knock down other objects. Examples of solutions could include tools such as a ramp to increase the speed of the

Assessment Boundary - S.K.PS.2.2.AB:
Assessment does not include friction as a mechanism for change in speed.

Science and Engineering Practices - PK2.SEP4.3:
Analyze data from tests of an object or tool to determine if it works as intended.

Disciplinary Core Ideas - S.K.PS.2.2.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. ETS1.A: Defining Engineering Problems •A situation that ppeople want to change or create can be approached as a problem to be solved through engineering. Such problems may have many acceptable solutions. (secondary to K-PS2-2)

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