Chapter 3

Question 1

Section 1

Answer 1

,

Question 2

fluid

Answer 2

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

Question 3

pressure

Answer 3

the amount of force exerted per unit area of a surface

Question 4

pascal

Answer 4

the SI unit of pressure

Question 5

atmospheric pressure

Answer 5

the pressure caused by the weight of the atmosphere

Question 6

Section 2

Answer 6

,

Question 7

buoyant force

Answer 7

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

Question 8

Archimedes principle

Answer 8

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

Question 9

Section 3

Answer 9

,

Question 10

Bernoulli’s principle

Answer 10

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

Question 11

lift

Answer 11

an upward force on an object that moves in a fluid

Question 12

thrust

Answer 12

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

Question 13

drag

Answer 13

a force parallel to the velocity of the flow

Question 14

Pascal’s principle

Answer 14

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