Do Now!

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Do Now!
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Last lesson
Speed investigation
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Todays lesson

• Interpreting distance-time and speed-time graphs

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Distance against time graphs
distance
time
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No movement?
distance
time
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No movement
distance
time
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Constant speed?
distance
time
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Constant speed
distance
time
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Constant speed
distance
The gradient of this graph gives the speed
time
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Constant speed
How would the graph look different for a faster
constant speed?
distance
time
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Constant speed
fast
distance
time
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Constant speed
fast
How would the graph look different for a slower
constant speed?
distance
time
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Constant speed
fast
distance
slow
time
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Getting faster? (accelerating)
distance
time
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Getting faster
distance
time
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Examples
distance
time
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A car accelerating from stop and then hitting a
wall
distance
time
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A car accelerating from stop and then hitting a
wall
distance
time
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Speed against time graphs
speed
time
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No movement?
speed
time
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No movement
speed
time
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Constant speed?
speed
time
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Constant speed
speed
time
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Constant speed
How would the graph look different for a faster
constant speed?
speed
time
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Constant speed
speed
fast
time
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Constant speed
How would the graph look different for a slower
constant speed?
speed
fast
time
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Constant speed
speed
fast
slow
time
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Getting faster? (accelerating)
speed
time
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Getting faster? (accelerating)
speed
Constant acceleration
time
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Getting faster? (accelerating)
speed
The area under the graph gives the distance
travelled
time
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Example
speed
time
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A dog falling from a tall building (no air
resistance)
speed
time
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A dog falling from a tall building (no air
resistance)
speed
time
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A dog falling from a tall building (no air
resistance)
speed
Area height of building
time
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Be careful!
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No movement
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Constant speed
Area distance travelled
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Constant acceleration
Area distance travelled
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Questions!
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Balls!
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Investigating rolling balls!

• Prediction
• Table of results (Mass, circumference or
  diameter, Distance, time (measured several
  times), speed)
• Suitable graph
• Conclusion
• Evaluation