Do Now! Can you put the syllabus and Definition list in your folders for our new topic Topic 2: Mechanics

A reminder

Average speed = distance travelled time taken S t d x

Let’s Measure some speeds Evening all!

Distance against 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 gradient of this graph gives the speed

Constant speed distance time How would the graph look different for a faster constant speed?

Constant speed distance time fast

Constant speed distance time fast How would the graph look different for a slower constant speed?

Constant speed distance time fast slow

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

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 = distance travelled

Constant acceleration distance time speed time Area = distance travelled Gradient = acceleration a = (v-u)/t

Now let’s try some questions! Jack Yes!