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Created page with "==Key Stage 4== ===Meaning=== A '''velocity-time graph''' is a graph that shows how the velocity of an object changes with time. ===About Velocity Time Graphs..."
==Key Stage 4==
===Meaning===
A '''velocity-time graph''' is a [[graph]] that shows how the [[velocity]] of an [[object]] changes with [[time]].
===About Velocity Time Graphs===
: '''Velocity-time graphs''' give information about the journey taken by an [[object]].
: On a '''velocity-time graph''' the [[velocity]] is plotted on the [[y-axis]] and the [[time]] is plotted on the [[x-axis]].
: A '''velocity-time graph''' can be used to calculate the [[acceleration]] of an [[object]] or the [[distance]] travelled by the [[object]].
{| class="wikitable"
| style="height:20px; width:200px; text-align:center;" |'''Constant Velocity'''
| style="height:20px; width:200px; text-align:center;" |'''Accelerating'''
| style="height:20px; width:200px; text-align:center;" |'''Decelerating'''
|-
|[[File:vtGraphConstantv.png|center|200px]]
|[[File:vtGraphAccelerating.png|center|200px]]
|[[File:vtGraphDecelerating.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |A [[gradient]] of zero shows the [[object]] is travelling at a constant [[velocity]].
| style="height:20px; width:200px; text-align:center;" |[[Acceleration]] is shown by a positive [[gradient]].
| style="height:20px; width:200px; text-align:center;" |[[Deceleration]] is shown by a negative [[gradient]].
|}
===Example Calculations===
====Calculating Acceleration====
: The speed can be calculated from a '''distance time graph''' by reading the graph and using the equation [[Speed=Distance/Time]].
{| class="wikitable"
|-
|[[File:vtGraphCalculation1.png|center|300px]]
|[[File:vtGraphCalculation2.png|center|300px]]
|-
| style="height:20px; width:300px; text-align:left;" |'''Calculate the [[acceleration]] of the object in the first 10 seconds of the journey.'''
| style="height:20px; width:300px; text-align:left;" |'''Calculate the [[acceleration]] of the object in the first 10 seconds of the journey.'''
|}
{| class="wikitable"
|-
|[[File:vtGraphCalculation1.png|center|300px]]
|[[File:vtGraphCalculation2.png|center|300px]]
|-
| style="height:20px; width:300px; text-align:left;" |'''Calculate the [[distance]] travelled by the [[object]] in the first 20 seconds the entire journey.'''
| style="height:20px; width:300px; text-align:left;" |'''Calculate the [[distance]] travelled by the [[object]] over the entire journey.'''
|}
===Meaning===
A '''velocity-time graph''' is a [[graph]] that shows how the [[velocity]] of an [[object]] changes with [[time]].
===About Velocity Time Graphs===
: '''Velocity-time graphs''' give information about the journey taken by an [[object]].
: On a '''velocity-time graph''' the [[velocity]] is plotted on the [[y-axis]] and the [[time]] is plotted on the [[x-axis]].
: A '''velocity-time graph''' can be used to calculate the [[acceleration]] of an [[object]] or the [[distance]] travelled by the [[object]].
{| class="wikitable"
| style="height:20px; width:200px; text-align:center;" |'''Constant Velocity'''
| style="height:20px; width:200px; text-align:center;" |'''Accelerating'''
| style="height:20px; width:200px; text-align:center;" |'''Decelerating'''
|-
|[[File:vtGraphConstantv.png|center|200px]]
|[[File:vtGraphAccelerating.png|center|200px]]
|[[File:vtGraphDecelerating.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |A [[gradient]] of zero shows the [[object]] is travelling at a constant [[velocity]].
| style="height:20px; width:200px; text-align:center;" |[[Acceleration]] is shown by a positive [[gradient]].
| style="height:20px; width:200px; text-align:center;" |[[Deceleration]] is shown by a negative [[gradient]].
|}
===Example Calculations===
====Calculating Acceleration====
: The speed can be calculated from a '''distance time graph''' by reading the graph and using the equation [[Speed=Distance/Time]].
{| class="wikitable"
|-
|[[File:vtGraphCalculation1.png|center|300px]]
|[[File:vtGraphCalculation2.png|center|300px]]
|-
| style="height:20px; width:300px; text-align:left;" |'''Calculate the [[acceleration]] of the object in the first 10 seconds of the journey.'''
| style="height:20px; width:300px; text-align:left;" |'''Calculate the [[acceleration]] of the object in the first 10 seconds of the journey.'''
|}
{| class="wikitable"
|-
|[[File:vtGraphCalculation1.png|center|300px]]
|[[File:vtGraphCalculation2.png|center|300px]]
|-
| style="height:20px; width:300px; text-align:left;" |'''Calculate the [[distance]] travelled by the [[object]] in the first 20 seconds the entire journey.'''
| style="height:20px; width:300px; text-align:left;" |'''Calculate the [[distance]] travelled by the [[object]] over the entire journey.'''
|}