Do Now!
Todays lesson Interpreting distance-time and speed-time graphs
A reminder
Average speed = distance travelled time taken S t d x
Distance against time graphs distance time
Lets go on the corridor! Quietly and sensibly! Youll need a pencil and your books
Distance/time graph Distance /m Time (slow)/s Time (fast)/s Distance/m Time (slow/s Time (fast)/s
No movement? distance time
No movement distance time
Constant speed? distance time
Constant speed distance time
Constant speed distance time The gradient of this graph gives the speed
Constant speed distance time How would the graph look different for a faster constant speed (walking to Physics)?
Constant speed distance time fast
Constant speed distance time fast How would the graph look different for a slower constant speed (walking to French)?
Constant speed distance time fast slow
Constant speed distance time fast slow The gradient of the graph gives the speed
Constant speed distance time ΔyΔy ΔxΔx Gradient = Δy/Δx
Lets go on the corridor! Quietly and sensibly! Youll need a pencil and your books
Can you read what Mr Porter has written in your book and then finish the questions you did last lesson? Do now!
Distance/time graph - acceleration Distance /m Time/s Distance/m Time/s
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 Lets 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 gradient of this graph gives the acceleration
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
Getting faster? (accelerating) speed time The area under the graph gives the distance travelled
Example: speed time
A dog falling from a tall building (no air resistance) speed time
A dog 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
Be careful! distance time speed time
No movement distance time speed time
Constant speed distance time speed time Area under graph = distance travelled gradient = speed
Constant acceleration distance time speed time Area under graph = distance travelled Gradient = acceleration = a = (v-u)/t
Reading – Pages 26 to 29
Now lets try some questions! Page 27 questions 2, 5, 6, 7. Page 29 questions 1 & 2.