Pg. 84 #1 and Pg. 86 #7-9 1. 7. 8. 9.. Physical Science 3.2 “Fluids”

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Presentation transcript:

Pg. 84 #1 and Pg. 86 #

Physical Science 3.2 “Fluids”

Archimedes solved many problems for King Heiro of Syracuse. His most famous solution is associated with Heiro's new crown. Heiro had given the goldsmith the exact amount of gold needed for the crown. After it was made, Heiro suspected that it might not have as much gold as it was supposed to. King Heiro summoned Archimedes, and Archimedes was bewildered with the king's problem. But later, when Archimedes got into his full bathtub, it occurred to him that the volume of water that spilled out of the tub was equal to the volume he displaced. Reasoning that a much lower volume of water would be displaced by something denser (like gold) even though of equal weight, he saw the answer to the king's problem. The next day Archimedes told they king of his discovery. Archimedes put the king's new crown in a tub of water and found that the crown indeed displaced more water than the same weight of gold (it occupied more volume because it had been adulterated with lower density silver). The goldsmith was immediately beheaded.

Liquid Review… Shape  Indefinite Volume  Definite Ability to flow Medium particle movement Medium particle attraction

I. Buoyant Force A. Def – the upward force that a fluid exerts on an object. 1. results in an apparent loss of _________  easy to lift  opposite force of gravity B. History 1. Archimedes' Principle Buoyant force = Weight of displaced fluid Weight

C. Density (density = mass / volume) (pg. 82) 1. Altering density  increase volume / surface area…

II. Fluids and Pressure A. Def – the push of a fluid on the wall of its container. B. Dig. C. Unit - Pascal D. P = F / A

E. Pascal’s Principle 1. Change in pressure is exerted evenly throughout the liquid. 2. Ex:

In Class Assignment 1. A water bed has the dimensions of 1.2 m and 1.7 m. If the beds weighs 1200 N, what is the pressure of the waterbed on the floor? 2. A similar water bed has dimensions of 1.3 m and 1.6 m. If the bed has a mass of 130,000 g, what is the pressure of the bed on the floor? 588 Pascals Pascals