Speeds of a Rising and Falling One Dimensional Projectile
This slide shows the (t,y) graph of the Angry Bird's motion from the lab we did. Clearly the position graph is NOT linear, but constantly changing slope, indicating a changing velocity. As the previous slide showed, the graph indicates that the bird had a positive (upwards) velocity until about 0.3 seconds, but was slowing down. From 0.3 seconds until it hit at 0.9 seconds, it had a negative (downward velocity) but was getting faster and faster. At 0.3 the slope was zero, indicating that it was stopped, as was clearly visible in the previous slide. Each lab group analyzed a similar video and copied the data into a file that can be read by a spreadsheet program like Microsoft Excel or LibreOffice Calc or Google Docs. Note the odd looking values on the spreadsheet on the left. This is how scientific notation is entered on a computer. Cell A4 displays a time of 6.67E-002. We'd say that as "6.67 times 10 to the negative 2 seconds" and in regular numbers it would be 0.0667 seconds.
We use this data as a model for all constant acceleration one dimensional forces. We will find that the equation for the graph is y = y˳ + v˳t + ½at²
Speeds of a Rising and Falling One Dimensional Projectile
This slide shows the (t,y) graph of the Angry Bird's motion from the lab we did. Clearly the position graph is NOT linear, but constantly changing slope, indicating a changing velocity. As the previous slide showed, the graph indicates that the bird had a positive (upwards) velocity until about 0.3 seconds, but was slowing down. From 0.3 seconds until it hit at 0.9 seconds, it had a negative (downward velocity) but was getting faster and faster. At 0.3 the slope was zero, indicating that it was stopped, as was clearly visible in the previous slide. Each lab group analyzed a similar video and copied the data into a file that can be read by a spreadsheet program like Microsoft Excel or LibreOffice Calc or Google Docs. Note the odd looking values on the spreadsheet on the left. This is how scientific notation is entered on a computer. Cell A4 displays a time of 6.67E-002. We'd say that as "6.67 times 10 to the negative 2 seconds" and in regular numbers it would be 0.0667 seconds.
We use this data as a model for all constant acceleration one dimensional forces. We will find that the equation for the graph is y = y˳ + v˳t + ½at²