Speed & Stuff

1. Speed & Stuff http://www.scopeformoney.com/website-speed-one-of-ranking-factors-on-google-now

2. Todays Lesson • Working Out Speed • Small Activity • Distance Time Graphs • Reading Speed Time Graphs • Plotting Speed Time Graphs • Some slides and information have been borrowed/stolen from Mr Duffield 

3. Average Speed • Average Speed = Distance Travelled / Time Taken • Speed is a measure of how fast something moves. • Units are m/s (or cm/s, km/s etc). • EG; Lisa walked to M311 to M305 in 7 seconds. The distance between the rooms is 24 meters. • What was Lisa’s average speed?

4. Working Out Average Speed • Get into a group of 3 or 4 students. • You will need 5 One Meter Rulers (groups will need to share the rulers) and a stop watch • Estimate which students in your group will have the fastest and slowest walking an running speed over 5 meters. • You will also need your laptop, graph paper, a pencil and a ruler.

5. Doing The Activity • Each student will need to walk 5 meters and have it timed. You will then work out the average speed in a table. • Once this is completed, you will complete the same but with running. • After all students have been tested, put the results in a table and graph the average speed per person.

6. Distance Time Graph • This shows you how far something has travelled from a starting point in a particular amount of time. • If an object starts at zero and ends at zero for distance, it means the went back to the starting point. • If the distance is getting larger, it’s going away from the starting point. • If the distance is getting smaller, it’s going towards the starting point.

7. http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr/explaining_motion/describingmotionrev2.shtmlhttp://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr/explaining_motion/describingmotionrev2.shtml

8. Speed Time Graphs • In a Speed Time Graph, if the line is flat it is travelling at the same speed. • If the line is moving in an upward direction then the object is accelerating (getting faster) • If the line is moving in a downward direct them the object is decelerating (getting slower).

9. http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr/explaining_motion/describingmotionrev3.shtmlhttp://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr/explaining_motion/describingmotionrev3.shtml

10. Motion Graphs • Motion = movement • A motion graph is used to show how something moves, and how its movement changes over time. It can show: • whether an object is stationary or moving • an object's speed. • if and how its speed is changing (acceleration or deceleration). • A motion graph can show all of the above on the same graph.

11. Continued • Time always goes on the x axis. • A distance-time graph shows how far something has travelled on the Y axis. • Distance can not go backwards. • A speed-time graph shows how fast something is moving on the Y axis.