HS-PS3-5
The standard
Develop and use a model of two objects interacting through electric or magnetic fields to illustrate the forces between objects and the changes in energy of the objects due to the interaction.
Next Generation Science Standards
What this standard means
Students need to model how two objects affect each other without touching, using electric or magnetic fields. They should show force direction, attraction or repulsion, distance changes, and how energy shifts between the objects and the field.
Mastery looks like a labeled diagram or written model that connects position, force, and energy changes in one two-object system. Students often mix up force and energy, forget the field stores energy, or draw arrows that do not match attraction or repulsion.
Ways to teach it
- Give pairs bar magnets, paper, and iron filings, then have them sketch field patterns and force arrows for two magnet positions.
- Ask students to explain what happens to energy when two opposite charges are released from rest and move closer together.
- Use an exit ticket with two charged spheres and ask for force arrows, motion prediction, and one sentence about energy change.
- Connect the model to a phone charger magnet, refrigerator magnet, or static cling from a balloon on hair.
Plan a lesson for HS-PS3-5
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