Physics 12 Projectile Motion Lab Part Deux.
DUE week of Nov 16-20
Do by yourself . Everyone will have a video to analyze.
1.
Film yourself throwing a projectile at an angle above the horizontal. Throw it slowly enough that
it is in frame for at least a second, and not blurred ( eg: forget about Nerf darts - they go way too
fast ).
TIPS FOR FILMING!
- use a tripod or steadying device, if the camera moves it introduces error.
- throw against as plain a background as you can find, preferably one with vertical lines to act as
a vertical reference.
- use an object that contrasts well with the background.
- make sure there is a metre stick or object of know length visible in the shot
- make sure there is a point in the shot you can use for reference as an origin.
- use a digital camera with movie mode, mobile device or laptop with a webcam.
- Make sure the file is in one of the following video formats
.MOV - standard for Apple products ( Quicktime )
.AVI - older Windows format
.MPEG - older format
NOTE: Windows Movie Maker creates .WMV files which are not compatible.
2.
Download and install Logger Pro from my website. There is a Mac version and a PC version.
There may be a similar product for IOS or Android, but you need to send me the file in Logger
Pro format ( *.CMBL)
- copy the movie file to a location on your computer ( the Desktop is always a good option )
- use a video editing program to cut the clip down to just the segment you want to analyze
( optional)
- import the movie into Logger Pro ( Import>Movie).
- select the “enable/disable video analysis” button
- set an origin
- set a scale
- plot points for your object
- find the slope of the graph of X vs t ( horizontal velocity ) ( Analyze > linear fit )
- find the slope of the graph of Vy vs t ( vertical acceleration - verify that this is ~9.8 m/s/s )
( Analyze > linear fit )
- find a curve that fits the graph of Y vs t ( what equation does this represent? )
( Analyze > curve fit, quadratic )
3.
Save the .CMBL file and email it AND the original video to me as an attachment. If your email
service ( or mine ) will not permit large attachments then bring it to me on a memory stick