Chapter 3

Question 1

Fluid

Answer 1

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

Question 2

Pressure

Answer 2

The amount of force exerted per unit area of a surface

Question 3

Pascal

Answer 3

the Si unit of pressure

Question 4

Atmospheric pressure

Answer 4

the pressure cuased by weight of the atmosphere

Question 5

Buoyant force

Answer 5

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

Question 6

Archimedes’ principal

Answer 6

The boyant force of an object in a fluid is an upward force equal to the weight of the volume of fluid that object displaces

Question 7

Bernolii’s Princiapla

Answer 7

The pressure in a f luid decreases as the fluid’s velocity increases

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 or rocket

Question 10

Drag

Answer 10

A force parallel to the velocity of the flow: it opposes the direction of an aircraft and in combination with thrust can determine that speed of the aircraft

Question 11

Pasacal’s principal

Answer 11

Fluid in equilibrium contained in contained in a vessel exerts a pressure of equal intensity in all directions