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Traction
car?  hands?
rub
smooth vs. bumpy texture
heat = more friction

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Movement doesn't always mean unbalanced??

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Movement doesn't always mean unbalanced??

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-going at the same pace without an extra push or pull
-batteries make the car move, but without a force (push or pull)
-moving together, but not getting closer together is balanced

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How can gravity be a pull AND keep us where we are???

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How can gravity be a pull AND keep us where we are???

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Uneven
unfair
unbalanced
movement can lead to unbalanced pushes and pulls

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- more power
- harder push
- push or pull

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- out of the way
- forward

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when you push it harder it uses more energy
-body energy?

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- Car stops
- car "climbs" the box

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Materials you need for fire truck experiment

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Materials you need for fire truck experiment

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Boxes*
Books
Walls
Sticky Notes*
String*
Plastic tubs
Pencils

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smooth table
carpet has tiny cracks and loose strings
better grip on carpet

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-ramp up
-titled on one side, only two wheels touched carpet, bumping on the carpet
-running into obstacle

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-ramp down
-clear path
-books & journals, pencil box, cardboard box used for ramps

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hand to car
wind to napkin

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fastness or slowness
Distance (how far)
----------------------------
Time (seconds)

Ex: 60cm / 1s