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Per5_over - Preview of Period 5 Forces and Newtons Laws 5.1...

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Preview of Period 5: Forces and Newton’s Laws 5.1 The Fundamental Forces of Nature What are the four fundamental forces of nature? How do we see their effects? 5.2 Forces and Newton’s Laws What causes an object to move? How are force, acceleration, and the mass of objects related? What happens when one object exerts a force on another object? 5.3 The Frictional Force What are the two types of friction? What determines the amount of friction between objects? When is friction useful? 5-1
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Act. 5.1: 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. 5-2 + + + - - -
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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.
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