Including Checks for Understanding. WOW Notes #1: Density ρ m V.

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Presentation transcript:

Including Checks for Understanding

WOW Notes #1: Density ρ m V

WOW Notes #1 CFU: Density

WOW Notes #2: Weight

WOW Notes #2 CFU: Weight 5) What is the weight of m 3 of H 2 O? Answer: 2450 N 6) What is the weight of 700. cm 3 of Aluminum? Answer: 18.1 N

WOW Notes #3: Other “density” values ρgρg FgFg V

WOW Notes #3 CFU: Other density values 7. What is the weight in pounds of 50.0 gallons of water? Answer: 417 lbs. 8. What is the volume in cubic feet of 150 pounds of water? Answer: 2.4 cubic feet 9. What is the weight in pounds of the water contained in Liter bottles of water? Answer: 57 lbs.

WOW Notes #4: Archimedes and Buoyant Force Archimedes When a solid object is immersed in a fluid it displaces a volume of fluid equal to the volume of the solid.

WOW Notes #4 Continued Archimedes’ Principle: When an object is immersed in a fluid, it experiences a buoyant force equal to the weight of displaced fluid.

WOW Notes #4 Continued Apparent Weight = “true” weight– weight of displaced fluid (buoyant force) F g ´= F g – F b F g ´= V o ρ o g – V f ρ f g o = object and f = fluid Also works with mass instead of weight That is…apparent mass = “true” mass – mass of displaced fluid (buoyant “force”)

WOW Notes #4 Continued

WOW Notes #4 CFU: Archimedes and Buoyant Force What is the apparent weight of the aluminum block pictured when it is immersed in water? Answer: 1.1 N meters meters meters Aluminum

WOW Notes #5: Floating When an object FLOATS, the buoyant force and the object’s weight are equal to each other…NO NET FORCE. When an object is placed in a fluid it will either… Sink to the bottom because the weight of fluid it displaces (buoyant force) is less than the weight of the object. (the net force is downward) Sink into the fluid only to the point where it has displaced a volume of fluid equal to its weight. (the net force is zero)

WOW Notes #5 continued

WOW Notes #5 CFU: Floating 1) Cannonball floating? Cannonball floating? 2) Explain your observations of the cannonball using the following vocabulary. (underline) 1) Density, buoyant force, weight, displace/displacement, net force, volume

WOW Notes #6: Stability and the Center of Buoyancy

WOW Notes #6: CFU

WOW Notes #7: Draft

To calculate “Draft” as a ratio: Divide the volume of water necessary to displace by the volume of water that can be displaced. Divide the weight you must support by the weight of water that can be displaced.

WOW Notes #7: CFU

WOW Notes #8: Acceleration!