speed and time graphs
Post on 11-May-2015
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A reminder
Speed = distance
time taken
S tdx
Distance vs Time Graphs
distance
time
No movement?
distance
time
No movement
distance
time
Constant speed?
distance
time
Constant speed
distance
time
Constant speed
distance
time
The slope of this graph gives the speed
Constant speed
distance
time
How would the graph look different for a faster constant speed (walking to Mrs. Herrington’s
class)?
Constant speed
distance
time
fast
Constant speed
distance
time
fast
How would the graph look different
for a slower constant speed
(walking to Ms. Jones)?
Constant speed
distance
time
fast
slow
Constant speed
distance
time
fast
slow
The slope of the graph gives the
speed
Constant speed
distance
time
Rise
Run
Slope = Rise/Run
Getting faster? (accelerating)
distance
time
Getting faster (accelerating)
distance
time
Examples
distance
time
A car accelerating from stop and then hitting a wall
distance
time
A car accelerating from stop and then hitting a wall
distance
time
Let’s try a simulation
Speed against time graphs
speed
time
Speed against time graphs
speed
time
No movement?
speed
time
No movement
speed
time
Constant speed?
speed
time
Constant speed
speed
time
Constant speed
speed
time
How would the graph look
different for a faster constant
speed?
Constant speed
speed
time
fast
Constant speed
speed
time
fast
How would the graph look
different for a slower constant
speed?
Constant speed
speed
time
fast
slow
Getting faster? (accelerating)
speed
time
Getting faster? (accelerating)
speed
time
Constant acceleration
Getting faster? (accelerating)
speed
time
The slope of this graph gives the acceleration
Example:
speed
time
A dog falling from a tall building (no air resistance)
speed
time
A rock falling from a tall building (no air resistance)
speed
time
A dog falling from a tall building (no air resistance)
speed
time
Area = height of building
No movement
distance
time
speed
time
Constant speed
distance
time
speed
time
Area under graph = distance travelled
Slope = speed
Constant acceleration
distance
time
speed
time
Reading – Pages 26 to 29
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