Chapter 3

Question 1

Fluid

Answer 1

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 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 (symbol, Pa)

Question 4

Atmospheric Pressure

Answer 4

The pressure caused by the 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’ Principle

Answer 6

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 the object displaces

Question 7

Bernoulli’s Principle

Answer 7

The principle that states that the pressure in a fluid decreases as the fluids 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, determines the speed of the aircraft

Question 11

Pascal’s Principle

Answer 11

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