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PHYSICS U5 > FLUIDS IN MOTION > Flashcards

FLUIDS IN MOTION Flashcards

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1
Q

Streamline Flow

A

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

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2
Q

Turbulent Flow

A

Liquid Layers Mix

High Friction Between Layers

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3
Q

Why Does Air Flow Over Can Become Turbulent

A

Creates ‘Drag’ Which Slows Car Down

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4
Q

How Do Cars Spoilers Make Cars More Streamlined

A

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

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5
Q

Velocity Of Fluid Flow In Pipe

A

Velocity Of Fluid Highest In The Middle Of The Pipe

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6
Q

Flow Rate In & Out Of Pipe

A

Is Consistent

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7
Q

Bernoulli’s Principle - V & P

A

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

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8
Q

If Velocity Increases What Happens To The Pressure

A

Pressure Decreases

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9
Q

What Happens To The Velocity When Pipe Narrows

A

Increases

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10
Q

Mass Flow Rate Is Consistant Means

A

Same Amount Of Water Entering Must Leave

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11
Q

Features Of The Wing Shape

A

Wing Longer On The Top
Wing Shorter At The Bottom

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12
Q

Wing Is Longer At The Top Means

A

Air Travelling Over Top Of Wing Must Travel Further

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13
Q

What Happens To The Air Pressure On The Top Wing

A

It Reduces

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14
Q

Wing Shorter At The Bottom Means

A

Air Travels At The Bottom Of Wing Travels Shorter Distance

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15
Q

What Happens To The Air Pressure At The Bottom Wing

A

It Increases

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16
Q

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

A

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

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17
Q

Features Of Spoilers

A

Longer On The Bottom
Shorter On The Top

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18
Q

Why Is The Spoiler Longer At The Bottom

A

Air Travels Further

Travels At Higher Velocity

Reduces Air Pressure On The Bottom

There’s A Downwards Force On Spoiler

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19
Q

When Is The Viscosity Of Newtonian Fluid Constant

A

When Temperature Stays The Same

20
Q

What Effects The Viscosity Of Newtonian Fluid

A

Changing The Temperature

21
Q

Why Does Honey Flow More Easily When Heated

A

Particles Have More Energy

Forces Between Particles Are Weaker

22
Q

As Temperature Of Newtonian Liquid Increases, Viscosity Decreases Because

A

Liquid Density Decreases

Particles In Liquid Have More Energy

Particles Have Less Forces Between Them

They Can Flow More Easily

Flow Velocity Increases

23
Q

As Temperature Of Newtonian Gas Increases, Viscosity Increases Because

A

Particles Have More Energy

Particles Move Faster

Particles Collide More Often

Particles Move Less Energy

Increases Gases Resistance To Movement

24
Q

Shear Thickness Fluids

A

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

Particles Resist Movement

25
Q

Shear Thinning Fluids

A

Viscosity Decreases When Shear Force Is Applied

Layers Of Particles Slide Over Eachother More Easily

26
Q

Features Of Turbulent Water Flow

A

Increases Friction (Increases Drag)

Streamline Mix

Chaotic Flow

Speed Of Water Consistently Changing

27
Q

Effect Of Water Pressure When Pipe Narrows

A

Velocity Increases

The Pressure Decreases

28
Q

Factor That Affects The Pressure Of Oil In The Pipe

A

Diameter Of The Pipe

29
Q

Why Wedge Shape On The Car Allows It To Move Fast

A

Streamline Design

reduces Turbulence

less Air Action

30
Q

Bernoulli’s Principle, Why Two Balloons Move Towards Eachother

A

Air Flow Faster Between The Balloons

Faster Air Flow Reduces Air Pressure Between Balloons In Pressure Difference

31
Q

Describe How Shaking Glass Bottle Makes Ketchup Flow Quicker

A

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

32
Q

Explain Why Oobleck Acts Like A Solid When Jumped On

A

Viscosity Increases When Set

When Force Applied It Becomes Ridged & Resists Movement.

33
Q

Effects Of Low Temp On How Oil Acts As A Lubricant

A

When Cold, Oil Will Not Flow Through Engine Easily
As Oil Is Thicker

Oil Won’t Reach All Parts In The Engine

34
Q

Effects Of High Temperature Of Oil Acting As A Lubricant

A

The Oil Will Not Coat Moving Parts

Oil Thin Making Engine Wear Greater

Oil Will Flow Faster/ Quicker

35
Q

Laminar streamlined flow

A

Layers liq slide past eachother without disturbance

Low friction b/w layers

36
Q

Turbulence follow

A

Liq layers mix

High friction b/w Layers

37
Q

Air on the top wing

A

High Velocity

38
Q

What force is put on wing

A

Upward force on wing

39
Q

The distance air has to travel over spoiler shape

A

Shorter distance

40
Q

2 features of Turbulence water flow

A

⬆️ friction

Streamline cross eachother

Chaotic flow

Speed water constantly changing

41
Q

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

A

Viscosity ⬇️ when shear force applied

Layers particles slide over eachother easily

42
Q

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

A

Oil has lower viscosity

Particles have more energy
Less force b/w particles
Bonds broken

Oil flows faster

43
Q

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

A

Becomes thicker

Shear force applied

Resists movement

44
Q

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

A

Oil thicker

Wont move to all parts of engine

45
Q

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

A

Higher temp oil not coat all moving parts as thinner

Thin oil make engine wear grated

PHYSICS U5 (4 decks)

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