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# Physics On the Road - Lesson 5

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### Transcript

• 1. Using Technology to analyse motion Physics on the Road Lesson 5
• 2. LI&#x2026; &#x2022; Use a video camera to record motion data. &#x2022; Perform simple calculations of average speeds. &#x2022; Plot velocity&#x2013;time graphs. &#x2022; Use velocity&#x2013;time graphs to calculate distance travelled and acceleration.
• 3. Investigate &#x2022; We are going to use a video camera to investigate a ball rolling down a track. &#x2022; The video camera can be used in playback to break the motion of the ball into time intervals. &#x2022; The track is made of two metres rulers and so the displacement of the ball can be recorded for each time interval.
• 4. Data table &#x2013; use excel time /s displacement /m velocity ms-1
• 5. Motion Graphs &#x2013; use excel &#x2022; Calculate the average velocity for your ramp &#x2022; Plot a displacement &#x2013; time graph &#x2022; Estimate/calculate the gradient of the graph near the beginning and at the end of the graph. &#x2022; Calculate the average velocity for each time interval (use the spreadsheet) &#x2022; Plot a velocity time graph. Should be straight. &#x2022; Calculate the distance travelled using your velocity time graph. &#x2022; Find the gradient of the velocity time graph and hence show the acceleration.
• 6. Rolling Ball &#x2022; As a ball rolls down a track it accelerates (gains speed). &#x2022; This acceleration is due to the component of the balls weight (caused by the acceleration of gravity) acting down the track g &#x3B8; g
• 7. Acceleration due to gravity &#x2022; Using our results how can we find g? &#x2022; Compare your value to the accepted figure (9.81 ms-2) &#x2022; How can we improve this investigation? &#x2022; TABOO &#x2013; &#x201C;get more betterer/moderner equipment&#x201D; &#x2013; reliability of the data
• 8. Report - homework Rolling Ball Aim &#x2013; Use graphs and formulas to analyse the rolling of a ball and determine the acceleration due to gravity Variables Diagram Method Results Graphs Discussion - Explain what the results mean by identifying trends and patterns .Explain sources of error/uncertainty and difficulties. How these errors could be reduced. Indicate how the experiment could be improved in future. Conclusion
• 9. Friction compensate &#x2022; Try to adjust the gradient of your ramp to make it friction compensated. &#x2022; This means the ball will not gain speed but travel at a constant velocity. &#x2022; Check using the video camera. &#x2022; Record the data and plot a displacement time graph.