Vocab. 2/25/16

Question 1

fluid

Answer 1

a substance that has no fixed shape and yields easily to external pressure; a gas or (especially) a liquid.

Question 2

pressure

Answer 2

is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

Question 3

pascal

Answer 3

the SI unit of pressure, equal to one newton per square meter

Question 4

atmosphereic pressure

Answer 4

the pressure exerted by the weight of the atmosphere, which at sea level has a mean value of 101,325 pascals

Question 5

buoyant force

Answer 5

is an upward force exerted by a fluid that opposes the weight of an immersed object

Question 6

Archimendes Principle

Answer 6

the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces. Archimedes’ principle is a law of physics fundamental to fluid mechanics.

Question 7

Bernoullis Principle

Answer 7

flow of a nonconducting fluid, an increase in the speed of the fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid’s potential energy.

Question 8

Lift

Answer 8

an upward force on an object that moves in a fluid

Question 9

thrust

Answer 9

the pushing or pulling force exerted by the engine of an aircraft

Question 10

drag

Answer 10

a force parrallel to the velocity of the flow

Question 11

pascals princple

Answer 11

pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure variations