# Physics Definitions And Questions - Booklets 3.4 To 3.7

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Define The Newton
One Newton Is The Force That Causes A Mass Of One Kilogram To Have An Acceleration Of One Metre Per Second Per Second. (N)
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Define Weight
The Weight Of An Object Is The Gravitational Force Acting On An Object (N)
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Define Drag
Drag Is The Resistance To Motion Experienced By An Object Moving Through A Gas Or A Liquid (N)
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Define A Scalar Quantity
A Scalar Quantity Has A Size But Not A Direction
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Define A Vector Quantity
A Vector Quantity Has A Size And A Direction
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Define Terminal Velocity
The Constant Speed Reached By An Object When The Drag Force (And Upthrust) Is Equal And Opposite To The Weight Of The Object. At Terminal Velocity, Drag + Upthrust = Weight
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Define Equillibrium
At Equilibrium Resultant Force = 0 and Resultant Moment = 0
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Define A Couple
A Couple Is A Pair Of Equal And Parallel Forces Acting In Opposite Directions
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Define The Torque (Or Moment) Of A Couple
The Torque Of A Couple Is The Magnitude Of One Of The Forces Multiplied By The Perpendicular Distance Between The Forces (Nm)
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Define The Moment Of A Force
The Force Multiplied By The Perpendicular Distance From A Specified Point (Nm)
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Define The Principle Of Moments
The Principle Of Moments States That, For Any Object That Has No Resultant Moment, The Sum Of Its Clockwise Moments Must Equal The Sum Of Its Clockwise Moments About The Same Point
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Define Centre Of Gravity
A Point Where The Entire Weight Of An Object Appears To Act
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Define Density
Mass Per Unit Volume (Kg m^-3)
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Define Pressure
Normal Force Exerted Per Unit Cross-Sectional Area (Pa)
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Define Upthrust
Upthrust Is The Buoyant Force Exerted On A Body Immersed In A Fluid
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Define Archimedes Principle
The Upthrust Experienced By An Object In A Fluid Is Equal To The Weight Of The Fluid That It Displaces
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State And Explain A Limitation Of F=ma
It Cannot Be Used For Objects Travelling At Speeds Close To The Speed Of Light Because The Mass Of An Object Increases As It Nears The Speed Of Light
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If There Is No Resultant External Force Acting On A Stationary Object It Will?
Remain Stationary
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If There Is No Resultant External Force Acting On A Moving Object It Will?
Continue Moving In A Straight Line At The Same Velocity
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What Will A Resultant External Force Make An Object Do?
Accelerate
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What Is A Measure Of An Objects Tendency To Resist Changes In Motion?
It's Mass
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F=ma Only Applies When The Mass Of The Object In Question Is?
Fixed (Not Changing)
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List The Three Main Factors That Affect The Magnitude Of A Drag Force
01) Velocity 2) Cross-Sectional Area 3) Shape (How Streamlined An Object Is)
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When Is A Situation Said To Be "Static"?
When The Resultant Force Acting On A Body Is Zero And The Body Is Stationary/Not Moving
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When Else Can It Be Said That A Body Is In Equilibrium?
If The Body Isn't Accelerating And Is Travelling With Constant Velocity . That Means That Its Speed Is Constant And That Its Not Changing Direction
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Which Is Heavier, Lead Or Feathers?
For Equivalent Volumes, The Lead Would Have More Mass And Therefore A Larger Weigt
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Most Materials Expand With A Rise In Temperature, State And Explain The Affect That This Has On The Materials Density?
As The Materials Temperature Rises, The Volume Of The Material Rises. Density Is Inversely Proportional To Volume So, As The Materials Temperature Rises Its Density Decreases
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Give An Example Of When It's A Good Idea To Spread Pressure Over A Large Area
Snowshoes, Spread The Pressure To Avoid Sinking Into The Snow
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Give An Example Of When It's A Good Idea To Concentrate Pressure
A Needle, Concentrate The Pressure To Easily Pierce The Skin
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I Hope That You Do Well In Physics!
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## Other cards in this set

### Card 2

Define Weight

#### Back

The Weight Of An Object Is The Gravitational Force Acting On An Object (N)

Define Drag

### Card 4

#### Front

Define A Scalar Quantity

### Card 5

#### Front

Define A Vector Quantity