Ch.3 Forces in Fluids

Question 1

a non solid state of matter in which the atoms or molecules are free to move past each other, as in a gas or liquid

Answer 1

fluid

Question 2

the amount of force exerted per unit area of a surface

Answer 2

pressure

Question 3

the SI unit of pressure

Answer 3

pascal (Pa)

Question 4

the pressure caused by the weight of the atmosphere

Answer 4

atmospheric pressure

Question 5

the principle that states that the buoyant force on an object in a fluid is an upward force equal to the weight of the volume of fluid that displaces the object

Answer 5

Archimedes’ Principle

Question 6

the principle that states that the pressure in a fluid decreases as the fluid’s velocity increases

Answer 6

Bernoulli’s Principle

Question 7

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

Answer 7

thrust

Question 8

a force parallel to the velocity of the flow; it opposes the direction of an aircraft and, in combination with thrust, determines the speed of the aircraft

Answer 8

drag

Question 9

the principle that states a fluid in equilibrium contained in a vessel exerts a pressure of equal intensity in all directions

Answer 9

Pascal’s Principle

Question 10

an upward force on an object that moves in a fluid

Answer 10

lift

Question 11

the upward force that keeps an object immersed in or floating on a liquid

Answer 11

Buoyant Force