Horizontal Projectiles: Video Analysis
Horizontal Projectiles: Video Analysis
Name: ______Period: _____Date: ______
Set-up:
-Open up LoggerPro
-InsertMovie
- Browse to the public server, “IB Physics 2” folder, Gravitation sub-folder
- Double-click on “Galileo’s Projectile”
-Re-size the video frame if you’d like to make it a little bigger
-Click on the “expand tools” button in the lower right-hand corner:
-Click on “set scale”:
-The curser wil change to a + sign of sorts. Look for the vertical arrow labeled “1.00 m”. Click at the top of that arrow, and drag to the bottom of the arrow, then release the mouse.
-A pop-up window will appear asking you for the distance you just “highlighted”. Type 1.00 (m) in the box and hit “enter”
-Click on “Set Origin”: , then click at the location that you wish to set as your (0, 0) point (i.e. click on the corner of the table, or on the billiard ball itself, or at the base of the table on the floor…it doesn’t really matter—this is just a reference point for you)
-Once your origin is set, you need to get ready to collect data. Click on the “add point” button: , and you’ll be set to begin.
-To collect data, click on the billiard ball. Each time you click on it, the ball will move ahead 1 frame in the video. You’ll be collecting data until the video has finished (but 1 frame at a time. It automatically advances to the next frame)
-You do NOT need to write down your data table, but you will definitely need your graphs as you go through the analysis questions.
Horizontal Projectiles Video Analysis
Name: ______Date: ______Period: _____
1. Once you have collected all 30 data points, click somewhere in the graph to bring it to the foreground.
- What do the Red dots on your graph represent?
- What do the Blue dots on your graph represent?
2. Qualitatively describe both sets of data on your graph. Without using the words “accelerate” or “acceleration”, explain what your data tells us about the motion of the ball in both the x-direction and the y-direction.
3. Use a best-fit line to determine the average speed of the ball in the x-direction.
Average speed = ______
How did you determine this value?
4. Find the point at which the ball first starts moving in the vertical direction. Highlight the graph from that point to the end, and apply the appropriate best-fit. According to your data, what is the acceleration of the ball in the vertical direction in this video?
Acceleration = ______
Explain/Show how you determined this value.
5. Quantitatively compare your experimental value to the value you know the acceleration SHOULD be.