Physics On the Road - Lesson 5

• 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 velocitytime graphs. Use velocitytime 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 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.