Chapter 6

Question 1

fluid

Answer 1

a non solid state of matter in which the atoms or molecules are free to move past each other, as in 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

atmosphere 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

states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces and acts in the upward direction at the centre of mass of the displaced fluid

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 or rocket

Question 10

drag

Answer 10

pull (someone or something) along forcefully, roughly, or with difficulty ; the action of pulling something forcefully or with difficulty

Question 11

Pascal’s principle

Answer 11

is a principle in fluid mechanics that states that a pressure change occurring anywhere in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere