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Physics 19, 20, 21

Vocabulary and Formulas for The Physics test on 1-21-10

Formula for Pressure P=Force/Area
Pressure Due to Liquid Formula Pressure Due To Liquid=density*g*depth
Density =... Mass / Volume
When the weight of a submerged object is greater than the buoyant force, the object will... sink
Buoyant Force The net upward force exerted by a fluid on a submerged or immersed object.
Bouyancy the apparent loss of weight of objects when submerged in a liquid
When the weight of a submerged object is less than the buoyant force, the object will... float
Archimedes' Principle states that... the buoyant force on an immersed object is equal to the weight of the fluid it displaces. (also true for liquids and gasses)
The Principle of Flotation is... a floating object displaces a weight of fluid equal to its own weight.
Pascal's Principle changes in pressure at any point in an enclosed fluid at rest are transmitted undiminished to all points in the fluid and act in all directions
Atmospheric Pressure is caused by... the weight of air
Device to measure the pressure of the atmosphere Barometer
Boyle's Law the product of pressure and volume for a given mass of gas is a constant as long as the temperature doesn't change.
Boyle's Law Formula is... P1V1=P2V2
An object that is less dense than the air around it will ..... rise
Bernoulli's Principle States that... when the speed of a fluid increases, pressure in the fluid decreases, and vice-versa
Streamlines are the smooth paths or trajectories of the bits of fluid
Lift is the upward force created by the difference between the air pressure above and below the wing of an airplane.
In order for horizontal flight to be possible, what has to equal the lift. Weight
0 degrees Kelvin is equal to ____ degrees Celsius -273
Absolute Zero is when an object has no kinetic energy to give up
Heat is... energy that transfers from one object to another because of a temperature difference between them
The higher the temperature of a substance the ________ it's motion of molecules faster
When 2 substances of different temperatures are in thermal contact... heat flows from the higher temperature substance into the lower-temperature substance
thermal contact when heat flows from one object or substance to another one it is in contact with, the two objects are in thermal contact.
Thermal Equilibrium After objects in thermal contact with each other reach the same temperature, they are in thermal equilibrium.
Internal Energy is defined as... The grand total of all energies inside a substance.
When a substance gives off or takes in heat, it's internal energy ________ changes
A calorie is the amount of heat required to raise the temperature of 1 Gram of water by 1 Degrees Celsius
Most forms of matter- solids, liquids, and gasses- ____1____ when they are heated and ____2______ when they are cooled. 1. expand 2. contract
Bimetallic Strip is when... 2 strips of metals are welded or riveted together.
A thermostat is a practical application of a bimetallic strip that is used to control temperature.
Created by: ryan.lynch5
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