Do Now!
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![Page 1: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/1.jpg)
Do Now!
![Page 2: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/2.jpg)
Today’s lesson
• Interpreting distance-time and speed-time graphs
![Page 3: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/3.jpg)
A reminder
![Page 4: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/4.jpg)
A reminder
Average speed = distance travelled
time taken
S tdx
![Page 5: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/5.jpg)
Distance against time graphs
distance
time
![Page 6: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/6.jpg)
Let’s go on the corridor!
Quietly and sensibly!
You’ll need a pencil and your
books
![Page 7: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/7.jpg)
Distance/time graph
Distance /m
0 2 4 6 8 10 12 14 16
Time (slow)/s
Time (fast)/s
Distance/m 18 20 22 24 26 28 30 32
Time (slow/s
Time (fast)/s
![Page 8: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/8.jpg)
No movement?
distance
time
![Page 9: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/9.jpg)
No movement
distance
time
![Page 10: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/10.jpg)
Constant speed?
distance
time
![Page 11: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/11.jpg)
Constant speed
distance
time
![Page 12: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/12.jpg)
Constant speed
distance
time
The gradient of this graph gives the speed
![Page 13: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/13.jpg)
Constant speed
distance
time
How would the graph look
different for a faster constant
speed (walking to Physics)?
![Page 14: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/14.jpg)
Constant speed
distance
time
fast
![Page 15: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/15.jpg)
Constant speed
distance
time
fast
How would the graph look
different for a slower constant
speed (walking to French)?
![Page 16: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/16.jpg)
Constant speed
distance
time
fast
slow
![Page 17: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/17.jpg)
Constant speed
distance
time
fast
slow
The gradient of the graph gives
the speed
![Page 18: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/18.jpg)
Constant speed
distance
time
Δy
Δx
Gradient = Δy/Δx
![Page 19: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/19.jpg)
Let’s go on the corridor!
Quietly and sensibly!
You’ll need a pencil and your
books
![Page 20: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/20.jpg)
Can you read what Mr Porter has written in your book and then
finish the questions you did last lesson?
Do now!
![Page 21: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/21.jpg)
Distance/time graph - acceleration
Distance /m
0 2 4 6 8 10 12 14 16 18
Time/s
Distance/m 18 20 22 24 26 28 30 32
Time/s
![Page 22: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/22.jpg)
Getting faster? (accelerating)
distance
time
![Page 23: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/23.jpg)
Getting faster (accelerating)
distance
time
![Page 24: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/24.jpg)
Examples
distance
time
![Page 25: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/25.jpg)
A car accelerating from stop and then hitting a wall
distance
time
![Page 26: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/26.jpg)
A car accelerating from stop and then hitting a wall
distance
time
Let’s try a simulation
![Page 27: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/27.jpg)
Speed against time graphs
speed
time
![Page 28: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/28.jpg)
Speed against time graphs
speed
time
![Page 29: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/29.jpg)
No movement?
speed
time
![Page 30: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/30.jpg)
No movement
speed
time
![Page 31: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/31.jpg)
Constant speed?
speed
time
![Page 32: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/32.jpg)
Constant speed
speed
time
![Page 33: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/33.jpg)
Constant speed
speed
time
How would the graph look
different for a faster constant
speed?
![Page 34: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/34.jpg)
Constant speed
speed
time
fast
![Page 35: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/35.jpg)
Constant speed
speed
time
fast
How would the graph look
different for a slower constant
speed?
![Page 36: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/36.jpg)
Constant speed
speed
time
fast
slow
![Page 37: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/37.jpg)
Getting faster? (accelerating)
speed
time
![Page 38: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/38.jpg)
Getting faster? (accelerating)
speed
time
Constant acceleration
![Page 39: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/39.jpg)
Getting faster? (accelerating)
speed
time
The gradient of this graph gives the acceleration
![Page 40: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/40.jpg)
Getting faster? (accelerating)
speed
time
a = v – u
t
(v= final speed, u = initial speed)
v
u
The gradient of this graph gives the acceleration
![Page 41: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/41.jpg)
Getting faster? (accelerating)
speed
time
The area under the graph gives the distance travelled
![Page 42: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/42.jpg)
Example:
speed
time
![Page 43: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/43.jpg)
A dog falling from a tall building (no air resistance)
speed
time
![Page 44: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/44.jpg)
A dog falling from a tall building (no air resistance)
speed
time
![Page 45: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/45.jpg)
A dog falling from a tall building (no air resistance)
speed
time
Area = height of building
![Page 46: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/46.jpg)
Be careful!
distance
time
speed
time
![Page 47: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/47.jpg)
No movement
distance
time
speed
time
![Page 48: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/48.jpg)
Constant speed
distance
time
speed
time
Area under graph = distance travelled
gradient = speed
![Page 49: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/49.jpg)
Constant acceleration
distance
time
speed
time
Area under graph = distance travelled
Gradient = acceleration =
a = (v-u)/t
![Page 50: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/50.jpg)
Reading – Pages 26 to 29
![Page 51: Do Now!](https://reader031.fdocuments.net/reader031/viewer/2022032606/56812df4550346895d93537e/html5/thumbnails/51.jpg)
Now let’s try some questions!
Page 27 questions 2, 5, 6, 7.
Page 29 questions 1 & 2.