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Types of Forces and Gravitational Force

Types of Forces and Gravitational Force. 4.6 and 4.7. 4.6 Types of Forces. Some common forces Gravitational Force Normal Force Frictional Force Tension Force. Fundamental Forces. Unique forces All other forces are forms of these Gravitational Force Gravity Strong Nuclear Force

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Types of Forces and Gravitational Force

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  1. Types of Forces and Gravitational Force 4.6 and 4.7

  2. 4.6 Types of Forces • Some common forces • Gravitational Force • Normal Force • Frictional Force • Tension Force

  3. Fundamental Forces • Unique forces • All other forces are forms of these • Gravitational Force • Gravity • Strong Nuclear Force • Keeps nucleus of atoms together • Electroweak Force • Electricity, Magnetism, and Weak Nuclear Force (radioactivity)

  4. Nonfundamental Forces • Except for Gravitational all the common forces are nonfundamental • Others related to electromagnetic (electroweak) forces

  5. 4.7 Gravitational Force • Why does g = 9.80 m/s2? • It’s related to Newton’s Law of Universal Gravitation

  6. Newton’s Law of Universal Gravitation • Every particle in the universe exerts a force on every other particle • G = 6.673 x 10-11 N m2/kg2 • m1 and m2 are the masses of the particles • r = distance between the particles

  7. Newton’s Law of Universal Gravitation for Nonparticles • Using calculus – apply universal gravitation for bodies • Estimate (quite precisely) • Assume bodies are particles based at their center of mass • For spheres assume they are particles located at the center

  8. Example 1 • What is the gravitational attraction between a 75-kg boy (165 lbs) and the 50-kg girl (110 lbs) seated 1 m away in the next desk? • Fg = 2.5 x 10-7 N • = 2.6 x 10-8 lbs of force

  9. Weight • Gravitational Force the earth exerts on an object • Unit: Newton (N) • Remember!!! • Weight is a Force

  10. A Formula for Weight

  11. Relationship Between Weight and Mass • Weight  force of gravity on object • Force • Mass  measure of inertia of object • Amount of matter present

  12. Another Formula for Weight • r is usually RE • So g = 9.80 m/s2

  13. Example 2 • What is the weight of a 90 kg person? • W = 882 N • What is the mass of that person on the moon (g = 1.63 m/s2)? • m = 90 kg • W = 147 N

  14. Practice Work • 115 #CQ10, 12, P18 – 21, 23, 29 • Total of 8 Problems

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