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Understanding Forces and Energy in the Universe

Discover the essential concepts of force and energy, the four fundamental forces of the universe, and intriguing questions about gravity and electromagnetic interactions. Delve into the mysteries of how forces interact with matter and the sources of energy that move objects.

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Understanding Forces and Energy in the Universe

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  1. Distinguishing FORCE and ENERGY What do you already know, or want to know about forces and energy?

  2. FORCE • Is the go-between in any transfer of energy from one moving object to another. • Think of it as simply a pull or a push

  3. FORCE • The force does not come free! • A source of energy produces the force • Example: the potential energy in food, through our metabolism, is behind muscular force.

  4. THE FOUR FORCES OF THE UNIVERSE • Gravity • Electromagnetic Force • Strong Force • Weak Force

  5. Gravity • The attractive force between all masses • Has infinite range

  6. Electromagnetic Force • The attraction between negative and positive charges. • Has infinite range • Examples: magnetic attraction, electricity, static electricity, protons and electrons…

  7. Strong Force • The “short range” force that holds protons together in a nucleus • Only “exists” in the atomic nucleus itself

  8. Weak Force • Causes Beta decay and is short range like the strong force

  9. Questions to Consider • Although we know gravity exists, we don’t really know “why” it exists. • What causes gravity to exist? This remains a mystery, but scientists have many interesting theories. • Why is matter separated into positively and negatively charged particles? This also remains a mystery.

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