Students know magnets can be used to make some objects move without being touched.
The motion of objects can be observed and measured. As a basis for understanding this concept:
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Students know that magnets have two poles (north and south) and that like poles repel each other while unlike poles attract each other.
Students know how to build a simple compass and use it to detect magnetic effects, including Earth's magnetic field.
Students know electric currents produce magnetic fields and know how to build a simple electromagnet.
Students know the role of electromagnets in the construction of electric motors, electric generators, and simple devices, such as doorbells and earphones.