I'm not sure what you are looking for, but you might like the following links. Click on additional options to the left to hit different science areas for various ages.

Earth, Sun, and Moon
http://www.bbc.co.uk/schools/scienceclips/ages/9_10/earth_sun_moon.shtml

Circuits
http://www.bbc.co.uk/schools/scienceclips/ages/10_11/changing_circuits.shtml

Conductors and Insulators
http://www.bbc.co.uk/schools/scienceclips/ages/8_9/circuits_conductors.shtml

Friction
http://www.bbc.co.uk/schools/ks2bitesize/science/physical_processes/friction/play.shtml

Simple Machines
www.edheads.org/activities/simple-machines/

Good luck!