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# 8th Grade Chapter 4 Lesson 4 Slideshare

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For Student Use Only

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### Transcript

• 1. Pgs. 160-164 For Student Use Only
• 2. Archimedes discovered why gases float. Archimedes discovered why certain objects will float and certain objects will sink.
• 3. 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.
• 4. 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
• 5. 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.
• 6. 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
• 7. 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
• 8.
• 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: