# P2: Speed and Distance/Velocity Graphs

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• Created by: ja7sa096
• Created on: 20-04-16 21:11
What is speed?
Distance/time
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What is distance?
Speed * time
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What is time?
Distance/speed
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What are speed, distance and time measured in?
m/s, metres (m) and seconds (s)
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What is velocity?
The speed of something in a given direction
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You can accelerate without changing...
Speed
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What axis does time go on?
X axis
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What is the gradient of a distance time graph?
The velocity
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What is the gradient of a velocity time graph?
The acceleration
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What is the equation for acceleration?
change in velocity/ time
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What does a straight line on a distance time graph mean?
Stationary
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What does a straight line on a velocity time graph mean?
Constant speed
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What does a line slanting upwards on a distance time graph mean?
Constant speed
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What does a line slanting upwards on a velocity time graph mean?
Constant acceleration
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What does a line slanting downwards on a distance time graph mean?
Go backward at a constant speed
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What does a line slanting downwards on a velocity time graph mean?
Constant deceleration
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What does a curved line going upwards on a distance time graph mean?
Slow start, increased speed
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What does a curved line going downwards on a distance time graph mean
High speed, then decrease
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What does a curved line going upwards on a velocity time graph mean?
Slow acceleration, then increased acceleration
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What does a curved line going downwards on a velocity time graph mean?
Fast deceleration, then decreased deceleration
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How do you calculate the distance on a velocity time graph?
Work out the area under the graph
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What is stopping distance?
Thinking distance + braking distance
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What is thinking distance?
The distance travelled from seeing a stimulus to putting your foot on the brake i.e. reacting to the stimulus
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What is braking distance?
The distance travelled after the foot has been applied to the brake, until the vehicle become stationary
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What affects braking distance?
Quality and condition of brakes, tyre grip, icy roads, weather, footwear and mass/speed of the car
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What affects thinking distance?
Speed, alcohol/drugs, distractions (noise, phones, eating, smoking), age and visibility
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How is the thinking time represented on a graph?
Straight horizontal line
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How can cyclists reduce the air resistance acting on them?
Reduce their surface area and become more streamlined
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What effect does an increase in reaction time have on thinking, braking and total stopping distance?
Increase, stays the same, increase
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Why would the braking distance change on a wet road?
Less friction, wet and slippier, harder for tyres to grip, braking distance increased
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## Other cards in this set

### Card 2

#### Front

What is distance?

Speed * time

What is time?

### Card 4

#### Front

What are speed, distance and time measured in?

### Card 5

#### Front

What is velocity?