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Published byGeoffrey Powley Modified over 3 years ago

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Do Now!

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Todays lesson Interpreting distance-time and speed-time graphs

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A reminder

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Average speed = distance travelled time taken S t d x

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Distance against time graphs distance time

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Lets go on the corridor! Quietly and sensibly! Youll need a pencil and your books

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Distance/time graph Distance /m 0246810121416 Time (slow)/s Time (fast)/s Distance/m1820222426283032 Time (slow/s Time (fast)/s

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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 (walking to Physics)?

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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 (walking to French)?

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Constant speed distance time fast slow

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Constant speed distance time fast slow The gradient of the graph gives the speed

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Constant speed distance time ΔyΔy ΔxΔx Gradient = Δy/Δx

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Lets go on the corridor! Quietly and sensibly! Youll need a pencil and your books

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Can you read what Mr Porter has written in your book and then finish the questions you did last lesson? Do now!

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Distance/time graph - acceleration Distance /m 024681012141618 Time/s Distance/m1820222426283032 Time/s

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Getting faster? (accelerating) distance time

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Getting faster (accelerating) 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 Lets try a simulation

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Speed against time graphs speed 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 gradient of this graph gives the acceleration

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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

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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 under graph = distance travelled gradient = speed

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

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Reading – Pages 26 to 29

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Now lets try some questions! Page 27 questions 2, 5, 6, 7. Page 29 questions 1 & 2.

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PHYSICS – Speed, velocity and acceleration. LEARNING OBJECTIVES 1.2 Motion Core Define speed and calculate average speed from total time / total distance.

PHYSICS – Speed, velocity and acceleration. LEARNING OBJECTIVES 1.2 Motion Core Define speed and calculate average speed from total time / total distance.

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