Park and Play

Today we went to the park....they have all kinds of slides, see-saws, and swings for us to play on.  Mommy especially likes all the sand that's around and says that more of it comes home in our shoes than stays in the playground.  We don't know if that's really true but it is really fun there.

Sadie:  "Serena, move, or I'm going to slide right into you!"

Sadie: "That would be pretty funny but we'd both end up in a big pile in the sand!"

Sadie:  "Here I go!!!"

Scarlett:  "This sand gets everywhere!  It's like dirt or something!"

Serena: "Actually, Scarlett, sand is made up of minerals and ground up rock. As rocks erode from the forces of wind and water, tiny grains are worn off the rock and this is what forms sand.  A lot of sand is silica based. Furthermore silica sand is what window glass is made from and......Scarlett?  Sadie?"

Serena:  "Where did everyone go?"

Scarlett:  "All right, Sadie, this isn't that hard.  We're on a see-saw, I'm up, so you need to stand up so I can go back down and again....."

Sadie:  "It all sounds pretty pointless to me......all these ups and downs and we never really get anywhere."

Serena:  "Actually, Sadie's right.  Technically you're doing no work.  Work = Force x Distance.  You've got plenty of force but your total distance moved is zero and...um.....can I have a turn?