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Because the 

cart has 

centripetal 

force, she can 

turn corners 

easily. Without 

centripetal 

force, she 

would go off in 

a straight line.

Centripetal force makes it so items are 

pulled toward the center, like shown in 

the diagram.

Little Blue Dorothy is 

able to fly because of 

buoyancy, the upward 

push of a fluid. The 

way buoyancy works 

is when the 

density(how dense an 

object is)of the object 

is less than the fluid 

the object is in, the 

object will float. 

The formula for 

density is 

d=mass/volume

Mass is how much 

matter an object is 

composed of, and 

volume is how much 

space an object takes 

up.

The forces are now unbalanced so 

there is movement as buoyancy 

overtook the amount of gravity.

Little Blue Dorothy was almost to her Grandma's house, 

and then a hole sprung in her hot air balloon. She started 

to fall to the ground. This happened because of gravity. 

Gravity is a pull towards the center of the Earth, (and the 

force that opposes buoyancy.)   That means that once 

buoyancy goes away, gravity comes into play and pulls the 

object down.

The car goes slow because weight and the 

type of surface are the factors that affect 

friction, and this car has a large weight, and 

the surface is rough.

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