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

Answer 5

buoyant force

Question 6

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

Answer 6

Archimedes’ principle

Question 7

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

Answer 7

Bernoulli’s principle

Question 8

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

Answer 8

thrust

Question 9

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 9

drag

Question 10

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

Answer 10

Pascal’s principle

Question 11

an upward force on an object that moves in a fluid

Answer 11

lift