Today I had my 17th birthday party. We had a slip and slide and i thought that it was alllllll physics! the pictures are backwards but you can see as my friend, kira sasaki gains speed by running then launches herself onto the slip and slide. And due to the slippery surface of the plastic slip and slide, it's a "frictionless" surface. That's why in the picture on the top, she runs into her sister, Alyssa and stops due to the friction from the grass and from the collision with her sister. 
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