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8th Grade Chapter 4 Lesson 4 Slideshare
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8th Grade Chapter 4 Lesson 4 Slideshare

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8th Grade Chapter 4 Lesson 4 Slideshare 8th Grade Chapter 4 Lesson 4 Slideshare Presentation Transcript

  • Pgs. 160-164 For Student Use Only
  • Archimedes discovered why gases float. Archimedes discovered why certain objects will float and certain objects will sink.
  • Different objects displace different amount of water. Bouyancy= the tendency for an object to float when it is placed in a fluid. An object in water feels lighter and this is called bouyancy.
  • What is buoyant force? Archimedes principle of bouyancy: states the weight lost by an object immersed in a fluid is equal to the weight of the fluid displaced
  • Why do ships float but solid steel sinks?
    • Water pushes up with a bouyant force
    • Objects are pulled down with the force of gravity.
    • Objects size and mass help determine the bouyant force.
  • What is a submarine?
    • All of the above
    • A boat
    • Toy kids play with
    • Ship that sinks
    • A ship that can manuver on the surface or dive below
  • How do submarines and airships work?
    • Submarine-
    • *On the surface- displaces equal volume.
    • *To submerge- takes in water to displace less volume
    • Airships-
    • *Float better on the surface of the Earth due to the thicker air
    • What makes all these devices work?
      • Archimedes principle- object displace a volume equal to their own.
    • What are constraints in subs and airships?
      • Subs- hull
      • Airship- altitude
    NOTE: