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Published byHugo Owens Modified over 8 years ago
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Do Now!
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Last lesson Measuring speeds in a practical situation Composing a formal letter to the police Evening all!
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A reminder Average speed = distance travelled time taken S t d x
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Number plate Distance (m) Time (s)Speed (m/s)Speed (mph) Speeding?
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What to do now Calculate the speeds Convert to mph by multiplying by 2.24 Homework is to write a letter to the police informing them of which cars broke the speed limit and describing in detail how we measured the speeds (due Monday 1 st Feb)
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Speed Investigation Careful! Reliable? Sensible!
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Next lesson! Interpreting distance-time and speed-time graphs
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Distance against time graphs distance time
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No movement? distance time
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No movement distance time
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Constant speed? distance time
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Constant speed distance time
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Constant speed distance time The gradient of this graph gives the speed
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Constant speed distance time How would the graph look different for a faster constant speed?
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Constant speed distance time fast
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Constant speed distance time fast How would the graph look different for a slower constant speed?
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Constant speed distance time fast slow
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Getting faster? (accelerating) distance time
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Getting faster distance time
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Examples distance time
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A car accelerating from stop and then hitting a wall distance time
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A car accelerating from stop and then hitting a wall distance time
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Speed against time graphs speed time
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No movement? speed time
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No movement speed time
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Constant speed? speed time
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Constant speed speed time
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Constant speed speed time How would the graph look different for a faster constant speed?
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Constant speed speed time fast
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Constant speed speed time fast How would the graph look different for a slower constant speed?
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Constant speed speed time fast slow
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Getting faster? (accelerating) speed time
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Getting faster? (accelerating) speed time Constant acceleration
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Getting faster? (accelerating) speed time The area under the graph gives the distance travelled
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Example: speed time
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A dog falling from a tall building (no air resistance) speed time
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A dog falling from a tall building (no air resistance) speed time
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A dog falling from a tall building (no air resistance) speed time Area = height of building
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Be careful! distance time speed time
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No movement distance time speed time
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Constant speed distance time speed time Area = distance travelled
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Constant acceleration distance time speed time Area = distance travelled
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