An electric charge causes a force between objects. Unlike momentum or acceleration, people cannot see electrically charged atoms with their own eyes, let alone the particles that compose them. The charge of an object is either positive or negative. This picture contains a fork and a cup. The fork is made out of metal, which is a conductor. Conductors are materials that transfer electrons easily because they want to give them up. This is characteristic of a positive charge. Meanwhile, the cup is created with glass, which is an insulator. Insulators do not transfer electrons easily because they want to take electrons, which is a quality of a negative charge.
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