Do Now!. Todays lesson Interpreting distance-time and speed-time graphs.

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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 0246810121416 Time (slow)/s Time (fast)/s Distance/m1820222426283032 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 024681012141618 Time/s Distance/m1820222426283032 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.