HS-PS2-2 | Conservation of Momentum
Use mathematical representations to support the claim that the total momentum of a system of objects is conserved when there is no net force on the system.
Clarification statement: Emphasis is on the quantitative conservation of momentum in interactions and the qualitative meaning of this principle.
Assessment boundary: Assessment is limited to systems of two macroscopic bodies moving in one dimension.
Performance Level Descriptions
PLDs communicate the knowledge and skills expected of students to demonstrate proficiency in each Learning Standard. NYS assessments classify student performance into one of five levels.
Resources
Examples and discussion of resources for the learning, teaching, and assessment of HS-PS2-2.
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Assessment
What assessment of HS-PS2-2 might look like on a NY state exam.
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NGSS Dimensions
Performance expectation HS-PS2-2 was developed using the following elements from the NRC document A Framework for K-12 Science Education:
- Using Mathematics and Computational Thinking
- Use mathematical representations of phenomena to describe explanations.
- PS2.A: Forces and Motion
- Momentum is defined for a particular frame of reference; it is the mass times the velocity of the object.
- If a system interacts with objects outside itself, the total momentum of the system can change; however, any such change is balanced by changes in the momentum of objects outside the system.
- Systems and System Models
- When investigating or describing a system, the boundaries and initial conditions of the system need to be defined.