YouTube is a great tool to use with students, but sometimes you don't always want students to have to watch the entire video. Here are some cool tools to use to crop YouTube Videos:
Force a YouTube Video to Start a Certain Timestamp
Use this feature to have a YouTube video automatically start a certain timestamp.
Use TubeChop to crop the beginning and end of a YouTube video.
Tammy Worcester's YouTube Video Clipper
This is perfect if students do not have access to YouTube. Please see her post for directions on using this tool.