Para el tema de materiales he sacado los recursos siguientes de:
http://www.bbc.co.uk/schools/ks2bitesize/science/materials/changing_state/play.shtml

Materials:
See what happens when you cool and heat water. Try not to blow anything up!
http://www.bbc.co.uk/schools/ks2bitesize/science/flash/changing_state.swf'
Discover the characteristics of materials. How strong is glass? How flexible is metal?
Materials proof

'http://www.bbc.co.uk/schools/ks2bitesize/science/flash/characteristic_material.swf'

Find out the characteristics of rocks. Which rocks are permeable, float, split or wear well?
'http://www.bbc.co.uk/schools/ks2bitesize/science/flash/rocks_soils.swf'
Find the difference between a solid, a liquid and a gas.
'http://www.bbc.co.uk/schools/ks2bitesize/science/flash/gases.swf'