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12.4 Universal Forces

12.4 Universal Forces. Objectives. Describe factors affecting gravitational forces. Describe centripetal forces. Introduction/Review. Who developed the laws of motion? How many laws of motion exist? What is Newton’s first law of motion? What is Newton’s second law?

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12.4 Universal Forces

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  1. 12.4 Universal Forces

  2. Objectives • Describe factors affecting gravitational forces. • Describe centripetal forces.

  3. Introduction/Review • Who developed the laws of motion? • How many laws of motion exist? • What is Newton’s first law of motion? • What is Newton’s second law? • What is Newton’s third law?

  4. Universal Forces • Forces that occur naturally everywhere in the universe are called universal forces. Electromagnetic Nuclear Gravitational Centripetal

  5. Universal Gravitation • Gravitational force is an attractive force that acts between any two masses. • Newton’s law of universal gravitation states that every object in the universe attracts every other object. • The gravitational force between any two masses is directly proportional to their masses and inversely proportional to the distance between them. DUH!

  6. Sun Universal Gravitation Earth • Gravity is the weakest of the universal forces, but is the most effective force over long distances. Gravitational attraction

  7. Universal Gravitation • The gravitational attraction between the Earth and Moon causes the ocean tides. • The gravitational pull produces a bulge of water in the ocean on each side of the Earth. • The rotation of the Earth beneath these bulges produces two high and two low tides each day.

  8. Centripetal Force • Centripetal force is a center-directed force that keeps a rotating object moving in a circular path.

  9. Inertia Centripetal Force Circular path Centripetal force Demonstration

  10. Closure • TEST TOMORROW!!! • What will the test look like? • How many people would rather write on paper, then put their grades into the clicker? • What can you study? TAKE NOTES HOME!

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