It seems a good idea to tap into children's enthusiasm for the winter Olympics at Sochi and get a good primary science session going on linked to something they have seen.
Even the most casual observer of the games will realise that resistance - either of snow/ice or wind plays a big part in the final result.
So resources looking at forces seem an ideal link.
How about Feel the Force
The activities provide an opportunity for children to learn about the properties of air and in particular, the frictional force it exerts. The ideas are put into a real life context, that of a transport company looking for ways to reduce the fuel consumption of their lorries.