Introduction to Physical Science Monday, Wednesday, Thursday Tom Burbine

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Presentation transcript:

Introduction to Physical Science Monday, Wednesday, Thursday Tom Burbine

Quiz #3 Projectile Motion Densities Pressure in a liquid Pressure in a gas

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Gases and Liquids Primary difference is the distance between molecules Gas: Molecules are far apart Liquid: Molecules are closer due to cohesive forces Density of air at 10 o C is g/cm 3 or 1.2 kg/m 3

Air and liquids always flow from areas of high pressure to areas of low pressure

Boyle’s Law Product of the pressure and the volume for a given mass of gas is a constant as long as the temperature does not change P 1 V 1 = P 2 V 2

Atmospheric Pressure Weight of air above you Average pressure at sea level is 101,300 Pascals This pressure is called one atmosphere

Pascal’s Principle A change in pressure at any points in an enclosed fluid at rest is transmitted undiminished to all points in the fluid

P 1 = P 2 W 1 = W 2

Buoyancy in a gas An object surrounded by air is buoyed up by a force equal to the weight of the air displaced Archimedes Principle

For example Cubic meter of air has a mass of 1.2 kg Weight is Newtons Any object with a volume of 1 cubic meters is buoyed up with a force of Newtons If it has a mass less than 1.2 kilograms, it floats If it has a mass greater than 1.2 kilograms, it sinks

Bernoulli’s Principle When the speed of a fluid increases, internal pressure in the fluid decreases vshydrodynamics/ vshydrodynamics/

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