The skill being assessed is 3-PS2-4, which involves defining criteria and constraints for magnetic solutions. Design criteria are the requirements that a solution must meet to be successful, while constraints are limitations such as available materials, cost, size, or safety considerations. In this problem, the cafeteria sorts hundreds of cans daily using magnets, so the solution must handle high volume efficiently during peak times. Choice A works because it identifies appropriate criteria for success, such as sorting quickly and accurately, which is realistic, testable, and specific to the busy cafeteria problem. The distractors fail because they are unrealistic like improving taste or requiring long washing, or too vague like being 'really good.' To teach this, first define the problem clearly, then identify what the solution needs to do as criteria, and pinpoint limits like materials or safety as constraints. Finally, test if the criteria are measurable and ensure the constraints are realistic for the context.

This question evaluates defining criteria for magnetic solutions in real-world applications (3-PS2-4). Criteria specify what the solution must accomplish to be successful, while constraints are limitations on how it can work. The problem is sorting steel cans from aluminum cans quickly in a cafeteria, requiring understanding that magnets attract steel but not aluminum. Answer A correctly identifies the key criterion: the magnetic solution must attract steel cans but not aluminum cans, which is scientifically accurate and specific to the sorting task. Answer B (change color) is impossible and unrelated to magnetism, Answer C contains the misconception that aluminum is magnetic (it's not), and Answer D is too vague without measurable requirements. When teaching, demonstrate with actual magnets that steel/iron objects are attracted while aluminum is not, helping students understand how magnetic properties enable sorting solutions.

This question tests understanding of defining criteria and constraints for magnetic solutions (3-PS2-4). Criteria describe what the solution must accomplish to be successful, while constraints are limitations. The problem involves sorting mixed metal and plastic toy pieces using magnetic properties. Answer A correctly identifies specific criteria: pick up metal pieces quickly while leaving plastic pieces behind, utilizing the fact that magnets attract metal but not plastic. Answer B contradicts how magnets work since they cannot pick up plastic, Answer C is too vague and doesn't address the sorting function, and Answer D introduces an irrelevant user restriction. When defining criteria for magnetic sorting solutions, students should understand which materials magnets attract, create criteria that use this property effectively, and ensure criteria are specific to the sorting task.

The skill being addressed is 3-PS2-4: Define criteria and constraints for magnetic solutions. Design criteria are what the solution must do to be successful, while constraints are limitations such as materials, cost, size, or safety. In this problem, Ms. Lee needs to hang 20 artworks on a metal board using magnets, so the magnetic solution must securely hold the papers in place while allowing easy adjustments. Choice A works because it identifies appropriate criteria for success, like secure holding and easy movement, which are realistic, testable, and specific to the problem of displaying artworks. The distractors fail because B incorrectly assumes magnets stick to non-magnetic materials like plastic and wood, C is too vague and focuses on appearance rather than function, and D adds an irrelevant feature like playing music that doesn't relate to magnets or the task. To teach this, first define the problem clearly, then identify what the solution needs to do as criteria. Next, identify limits like available materials as constraints, test if criteria are measurable, and ensure constraints are realistic for the context.

The skill being addressed is 3-PS2-4: Define criteria and constraints for magnetic solutions. Design criteria are what the solution must do to be successful, while constraints are limitations such as materials, cost, size, or safety. In this problem, workers need to separate steel cans from aluminum cans using magnets, so the magnetic solution must attract magnetic materials like steel while ignoring non-magnetic ones like aluminum, doing so efficiently. Choice C works because it identifies appropriate criteria for success, like selective attraction and speed, which are realistic for 3rd-grade understanding, testable, and specific to sorting metals. The distractors fail because A ignores that magnets don't attract aluminum, B shifts focus to color instead of material, and D is too vague without specific measurable outcomes. To teach this, first define the problem clearly, then identify what the solution needs to do as criteria. Next, identify limits like time or materials as constraints, test if criteria are measurable, and ensure constraints are realistic for the context.

This question tests understanding of defining criteria and constraints for magnetic solutions (3-PS2-4). Design criteria are what the solution must do to be successful, while constraints are limitations like materials, cost, size, or safety requirements. The problem is that Ms. Lee needs to display 20 art papers on a metal board using magnets without damaging the papers. Answer A correctly identifies appropriate criteria: the magnets must hold papers securely without tearing or leaving marks, which is specific, measurable, and addresses the actual need. Answer B fails because it contradicts how magnets work (they stick to metal, not plastic), Answer C is too vague and doesn't relate to the magnetic function, and Answer D focuses on appearance rather than function. When defining criteria for magnetic solutions, students should identify what the solution needs to accomplish (hold papers), consider practical requirements (no damage), and ensure criteria are testable and specific to the problem.

The skill being addressed is 3-PS2-4: Define criteria and constraints for magnetic solutions. Design criteria are what the solution must do to be successful, while constraints are limitations such as materials, cost, size, or safety. In this problem, a sorting game uses magnets to separate metal toy pieces from plastic ones quickly, so the solution must attract magnetic materials while leaving non-magnetic ones behind. Choice A works because it identifies appropriate criteria for success, like selective attraction, which is realistic for 3rd-grade play, testable, and specific to material sorting. The distractors fail because B is impossible, C ignores material differences, and D focuses on appearance rather than function. To teach this, first define the problem clearly, then identify what the solution needs to do as criteria. Next, identify limits like time or safety as constraints, test if criteria are measurable, and ensure constraints are realistic for the context.

This question evaluates defining criteria and constraints for magnetic solutions (3-PS2-4). Criteria specify what makes a solution successful, while constraints define limitations. Students need to hang schedules inside metal lockers, requiring magnets that hold papers securely but allow easy removal. Answer A correctly identifies the key criteria: hold papers without damage (no ripping) and be easy to remove (repositioning capability). Answer B fails because it suggests sticking to plastic walls, but magnets don't attract to plastic—only to metal surfaces like locker walls. Answer C is too vague ('super good and work perfectly') without specific, testable criteria. Answer D introduces an unrelated feature (playing music) that doesn't address the paper-holding problem. Teaching strategy: have students test different magnet strengths on paper, identifying which hold securely without tearing when removed, then write criteria based on their observations.

The skill being assessed is 3-PS2-4, which involves defining criteria and constraints for magnetic solutions. Design criteria are the requirements that a solution must meet to be successful, while constraints are limitations such as available materials, cost, size, or safety considerations. In this problem, students need to hang schedules inside metal lockers using magnets instead of tape, so the solution must hold papers securely and allow easy removal without damage. Choice A works because it identifies appropriate criteria for success, such as holding and removing papers without ripping, which is realistic, testable, and specific to the locker problem. The distractors fail because they are unrealistic like sticking to non-magnetic wood, too restrictive like only one locker, or too vague like looking 'nice and cool.' To teach this, first define the problem clearly, then identify what the solution needs to do as criteria, and pinpoint limits like materials or safety as constraints. Finally, test if the criteria are measurable and ensure the constraints are realistic for the context.

This question assesses ability to define criteria and constraints for magnetic solutions (3-PS2-4). Criteria define what makes a solution successful, while constraints set limits on design like materials or cost. The problem requires separating steel cans from aluminum cans in a cafeteria using magnetic properties. Answer A correctly identifies the key criterion: the solution must attract steel cans (which are magnetic) but not aluminum cans (which are non-magnetic), utilizing the fundamental property that magnets only attract certain metals. Answer B is incorrect because magnets cannot attract aluminum or plastic, Answer C focuses on appearance rather than function, and Answer D introduces an irrelevant time constraint. To define good criteria for magnetic solutions, students should first understand what magnets can and cannot do, identify the specific problem to solve, and create measurable success criteria that use magnetic properties appropriately.