FLUIDS IN MOTION

Question 1

Streamline Flow

Answer 1

Layers Of Liquid Slide Past Eachother Without Disturbance.
Low Friction Between Layers

Question 2

Turbulent Flow

Answer 2

Liquid Layers Mix

High Friction Between Layers

Question 3

Why Does Air Flow Over Can Become Turbulent

Answer 3

Creates ‘Drag’ Which Slows Car Down

Question 4

How Do Cars Spoilers Make Cars More Streamlined

Answer 4

Air Flows Alger Car More Laminar, Less Turbulent Which Reduces Drag

Question 5

Velocity Of Fluid Flow In Pipe

Answer 5

Velocity Of Fluid Highest In The Middle Of The Pipe

Question 6

Flow Rate In & Out Of Pipe

Answer 6

Is Consistent

Question 7

Bernoulli’s Principle - V & P

Answer 7

Sum Of Pressure Energy & Kinetic Energy Is Consistent At Any Point

Question 8

If Velocity Increases What Happens To The Pressure

Answer 8

Pressure Decreases

Question 9

What Happens To The Velocity When Pipe Narrows

Answer 9

Increases

Question 10

Mass Flow Rate Is Consistant Means

Answer 10

Same Amount Of Water Entering Must Leave

Question 11

Features Of The Wing Shape

Answer 11

Wing Longer On The Top
Wing Shorter At The Bottom

Question 12

Wing Is Longer At The Top Means

Answer 12

Air Travelling Over Top Of Wing Must Travel Further

Question 13

What Happens To The Air Pressure On The Top Wing

Answer 13

It Reduces

Question 14

Wing Shorter At The Bottom Means

Answer 14

Air Travels At The Bottom Of Wing Travels Shorter Distance

Question 15

What Happens To The Air Pressure At The Bottom Wing

Answer 15

It Increases

Question 16

Why Does Air Travelling At The Top Of The Wing Travel At Higher Velocity

Answer 16

Reduces Air Pressure At The Top Of Wing
Upward Force On The Wing

Question 17

Features Of Spoilers

Answer 17

Longer On The Bottom
Shorter On The Top

Question 18

Why Is The Spoiler Longer At The Bottom

Answer 18

Air Travels Further

Travels At Higher Velocity

Reduces Air Pressure On The Bottom

There’s A Downwards Force On Spoiler

Question 19

When Is The Viscosity Of Newtonian Fluid Constant

Answer 19

When Temperature Stays The Same

Question 20

What Effects The Viscosity Of Newtonian Fluid

Answer 20

Changing The Temperature

Question 21

Why Does Honey Flow More Easily When Heated

Answer 21

Particles Have More Energy

Forces Between Particles Are Weaker

Question 22

As Temperature Of Newtonian Liquid Increases, Viscosity Decreases Because

Answer 22

Liquid Density Decreases

Particles In Liquid Have More Energy

Particles Have Less Forces Between Them

They Can Flow More Easily

Flow Velocity Increases

Question 23

As Temperature Of Newtonian Gas Increases, Viscosity Increases Because

Answer 23

Particles Have More Energy

Particles Move Faster

Particles Collide More Often

Particles Move Less Energy

Increases Gases Resistance To Movement

Question 24

Shear Thickness Fluids

Answer 24

Viscosity Increases When Shear Force Is Applied (e.g, shaken, stirred)

Particles Resist Movement

Question 25

Shear Thinning Fluids

Answer 25

Viscosity Decreases When Shear Force Is Applied Layers Of Particles Slide Over Eachother More Easily

Question 26

Features Of Turbulent Water Flow

Answer 26

Increases Friction (Increases Drag) Streamline Mix Chaotic Flow Speed Of Water Consistently Changing

Question 27

Effect Of Water Pressure When Pipe Narrows

Answer 27

Velocity Increases The Pressure Decreases

Question 28

Factor That Affects The Pressure Of Oil In The Pipe

Answer 28

Diameter Of The Pipe

Question 29

Why Wedge Shape On The Car Allows It To Move Fast

Answer 29

Streamline Design reduces Turbulence less Air Action

Question 30

Bernoulli’s Principle, Why Two Balloons Move Towards Eachother

Answer 30

Air Flow Faster Between The Balloons Faster Air Flow Reduces Air Pressure Between Balloons In Pressure Difference

Question 31

Describe How Shaking Glass Bottle Makes Ketchup Flow Quicker

Answer 31

Viscosity Decreases When Shear Pressure Is Applied As Ketchup Particles Slide Past Eachother

Question 32

Explain Why Oobleck Acts Like A Solid When Jumped On

Answer 32

Viscosity Increases When Set When Force Applied It Becomes Ridged & Resists Movement.

Question 33

Effects Of Low Temp On How Oil Acts As A Lubricant

Answer 33

When Cold, Oil Will Not Flow Through Engine Easily As Oil Is Thicker Oil Won’t Reach All Parts In The Engine

Question 34

Effects Of High Temperature Of Oil Acting As A Lubricant

Answer 34

The Oil Will Not Coat Moving Parts Oil Thin Making Engine Wear Greater Oil Will Flow Faster/ Quicker

Question 35

Laminar streamlined flow

Answer 35

Layers liq slide past eachother without disturbance Low friction b/w layers

Question 36

Turbulence follow

Answer 36

Liq layers mix High friction b/w Layers

Question 37

Air on the top wing

Answer 37

High Velocity

Question 38

What force is put on wing

Answer 38

Upward force on wing

Question 39

The distance air has to travel over spoiler shape

Answer 39

Shorter distance

Question 40

2 features of Turbulence water flow

Answer 40

⬆️ friction Streamline cross eachother Chaotic flow Speed water constantly changing

Question 41

Describe How Shaking Glass Bottle Makes Ketchup Flow Quickly (3)

Answer 41

Viscosity ⬇️ when shear force applied Layers particles slide over eachother easily

Question 42

Velocity of oil change due to change in viscosity when temp rises (3)

Answer 42

Oil has lower viscosity Particles have more energy Less force b/w particles Bonds broken Oil flows faster

Question 43

Explain why oobleck acts like a solid when jumped on (3)

Answer 43

Becomes thicker Shear force applied Resists movement

Question 44

Explain affects of low temp & how oil acts as lubricant (2)

Answer 44

Oil thicker Wont move to all parts of engine

Question 45

Effects of high temp how oil acts as lubricant (2)

Answer 45

Higher temp oil not coat all moving parts as thinner Thin oil make engine wear grated