Fundamental Forces. Gravitational force - an attractive force that exists between all objects. The gravitational force between the center of the Earth.

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Presentation transcript:

Fundamental Forces

Gravitational force - an attractive force that exists between all objects. The gravitational force between the center of the Earth and objects near it causes objects to fall toward the surface of the Earth.

Electromagnetic force – holds matter together by providing the force that binds atoms into molecules. The force between particles of opposite charge is attractive. The force between particles of the same charge is repulsive.

Since like charges repel one another, how can positively charged protons exist closely packed in an atomic nucleus? Strong nuclear force – holds protons and neutrons together in atomic nuclei. It is the strongest force, but it acts over only very short distances inside a nucleus.

Weak nuclear force – responsible for some kinds of radioactive decay, such as the decay that creates radon gas. It is the next to the weakest force, and acts only when particles are close together.