Do Now!
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Transcript of Do Now!
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Do Now!Can you put the “Unit 1
CONTENTS” sheet in the front of your
folders.
There will be a Unit 1 TEST on
Friday 25th September, when
Mr Porter will also collect in your
folders.
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A reminder
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No movement
distance
time
speed
time
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Constant speed
distance
time
speed
time
Area = distance travelled
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Constant acceleration
distance
time
speed
time
Area = distance travelled
Gradient = acceleration
a = (v-u)/t
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Today’s lesson
• Define displacement, velocity, speed and acceleration
• Explain the difference between instantaneous and average values of speed, velocity and acceleration
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Displacement
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Displacement
• Displacement the distance moved in a stated direction (the distance and direction from the starting point). A VECTOR
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Velocity?
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Velocity?
• Velocity is the rate of change of displacement. Also a VECTOR
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An interesting example
Think of a dog (dead) orbiting the earth with constant speed (in a circle).
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An interesting example
At this point, what is its velocity?
velocity?
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An interesting example
velocity
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An interesting example
velocity?
What is its velocity here?
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An interesting example
velocity
As you can see the velocity has changed as it is now going in another direction.
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An interesting example
velocity
We have constant speed but changing velocity.
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Acceleration?
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Acceleration?
• Acceleration is the rate of change of velocity. Also a VECTOR
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An interesting example
velocity
We have constant speed but changing velocity.
Of course a changing velocity means it must be accelerating!
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Average speed/velocity?
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Average speed/velocity?
• Average speed/velocity is change in distance/displacement divided by time taken over a period of time.
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Instantaneous speed/velocity?
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Instantaneous speed/velocity?
• Instantaneous speed/velocity is the change in distance/displacement divided by time at one particular time.
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Let’s try some questions!
Page 45 questions 1, 2, 3, 4, 5, 8, 10.