Bridget, Austin and Kevin are playing in the back yard. As Bridget
goes down a sliding board she asks why she can't slide up the slide.
Austin thinks that's a silly question: it's gravity, of course!
Bridget asks for an explanation of gravity, which Austin and Kevin
can't supply. Kevin does remember that the Soap Box Derby
is called the "Gravity Grand Prix." With that they decide
Alex should know the answer. Alex is working on his old car and
the kids ask him why the Soap Box Derby is called the Gravity Grand
Prix. He has them get into the car, which is facing downhill, and
shows them the emergency brake. When the brake is released the car
coasts forward. He gives a brief explanation of gravity.
the Teacher Guide (PDF file) Lesson begins on page 77.
Activities for Gravity