Chapter 3 Forces in fluids

Question 1

Fluid

Answer 1

A non solid state of matter in which 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 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 our floating on a liquid

Question 6

Archimedes Force

Answer 6

The principle that states that the buoyant force of 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 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

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