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Motion Graphs
What information can I get from a motion graphs?
Starter: Quick Quiz – prepare to answer some questions.
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QUESTION REVEALWill you get an easy or a hard one?10 seconds to answer:
State a unit for speed. If I run 200m in 20
seconds, what is my speed?
What is the resultant force?
Name 2 contact forces.
What is the equation for speed?
Name an “action at a distance” force.
What is the unit for weight?
Name 2 horizontal forces.
What as the difference between average speed and instantaneous speed?
1 3
4 5 6
7 8 9
2
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Learning Outcomes
• explore representing motion as a distance–time graph
• explore representing motion as a speed–time graph and H: a velocity–time graph
• explain the difference between speed and velocity
• H: explain the difference between displacement and distance
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What does this graph show? Discuss!!!
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This graph shows distance or displacement over time.
What is the difference?!
A “distance-time” graph
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Distance time graphsAt A the speed is constant.
At B the object has stopped
At C the object is moving again, at a constant rate, but quicker than before.
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Tasks:
1) Complete the section on the summary sheet on distance –time graph
2) Complete the practise questions.
3) Make a revision card showing a DT graph and label it.
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Using distance time graphs to work out your speed.
• Remember speed = distance/time
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Speed (velocity) – Time Graphs
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What does this graph show now ? Discuss!!!
Speed
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What about this “velocity” thing?
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Velocity-time graphsVelocity
(m/s)
Time (s)
1) Upwards line = acceleration
2) Horizontal line = constant speed
3) Steeper line = greater acceleration
4) Downward line = deceleration
The area under the line is equal to the distance travelled.
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Tasks
1) Make a revision card for Velocity – Time graphs.
2) Complete the summary sheet for V-T graphs.
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Practise the exam questions on Velocity – Time graphs
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Extension task
• Write down your journey to school. Include every time you walk, stop at a shop, sit on the bus, walk into the building etc and how long.
• Use this to draw a distance – time graph . Annotate it.
• Work out your speed (velocity) at each stage.