What are some science concepts I can talk about with preschoolers?

-Like gravity or fource, but those are already taken

I have to come up with a lesson plan,

something that has to do with sports or a certain sport.5 senses---I'm sure you can do the five senses with any sport :-)

Sink and Float---use sport objects to test...different types of balls etc.

Moving Motion

Freeze and Melt---- ice skating vs. swimming
you could talk about winter sports. Ice skating ( how ice is made) skiing (how snow is made). Or basketball (talk about taking measurements, have each kid jump, measure, and compare)
Maybe momentum like when you kick a ball the force gets transferred to the ball? I don't know because I'm not really good with kids.
sink & float

colour changing - mixing

magnets

plant growth

animal lifecycle
Rounders, cricket and forces of motion......
Projectile Motion like teeball. I know quite a few kids who played teeball when they were like 2 feet tall
http://science.preschoolrock.com/index.p鈥?/a>
the solar system.. like all the planets.