PBS Science Videos
PBS.org has a wealth of educational resources that educators can use (and all free!). For science activities, PBS Kids has three excellent shows: SciGirls, DragonflyTV, and Zoom. Each show has videos (on Youtube), suggestions for teachers to run the activities in their classrooms, and suit primary school ages. Ideally, have a specific science topic you are teaching about, and do a search to see if any of the three shows has resources on it.
More info – http://www.pbs.org/parents/scigirls
Sample Gravity/Friction Classroom activity – http://www.pbs.org/parents/scigirls/activities/parachute-parade/
Kid’s website – http://pbskids.org/dragonflytv/
Zoom info – http://www.pbs.org/parents/zoom
Activities – http://pbskids.org/zoom/activities/index.html