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Physics On the Road - Lesson 5
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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… • Use a video camera to record motion data. • Perform simple calculations of average speeds. • Plot velocity–time graphs. • Use velocity–time graphs to calculate distance travelled and acceleration.
  • 3. Investigate • We are going to use a video camera to investigate a ball rolling down a track. • The video camera can be used in playback to break the motion of the ball into time intervals. • 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 – use excel time /s displacement /m velocity ms-1
  • 5. Motion Graphs – use excel • Calculate the average velocity for your ramp • Plot a displacement – time graph • Estimate/calculate the gradient of the graph near the beginning and at the end of the graph. • Calculate the average velocity for each time interval (use the spreadsheet) • Plot a velocity time graph. Should be straight. • Calculate the distance travelled using your velocity time graph. • Find the gradient of the velocity time graph and hence show the acceleration.
  • 6. Rolling Ball • As a ball rolls down a track it accelerates (gains speed). • This acceleration is due to the component of the balls weight (caused by the acceleration of gravity) acting down the track g θ g
  • 7. Acceleration due to gravity • Using our results how can we find g? • Compare your value to the accepted figure (9.81 ms-2) • How can we improve this investigation? • TABOO – “get more betterer/moderner equipment” – reliability of the data
  • 8. Report - homework Rolling Ball Aim – 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 • Try to adjust the gradient of your ramp to make it friction compensated. • This means the ball will not gain speed but travel at a constant velocity. • Check using the video camera. • Record the data and plot a displacement time graph.