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Know that there are four fundamental forces in nature: gravitation, electromagnetism, weak nuclear force, and strong nuclear force.
Know that every object exerts gravitational force on every other object, and how this force depends on the masses of the objects and the distance between them.
Know that materials containing equal amounts of positive and negative charges are electrically neutral, but that a small excess or deficit of negative charges produces significant electrical forces.
Understand the relationship between force and pressure, and how the pressure of a volume of gas depends on the temperature and the amount of gas.
Explain how electric currents cause magnetism and how changing magnetic fields produce electricity (e.g., electric motors, generators).