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#1: What is the correct way of explaining how a vacuum cleaner works? (A or B?)
A) The spinning
motor creates a partial vacuum which creates a suction effect and draws
the dirt into the vacuum cleaner.
B) The spinning motor pushes air out of the vacuum cleaner. Gravity
pulling down on the outside air causes the air to rush in knocking dirt
in as it goes.
#3: Every once in awhile we hear of someone
getting stuck in a bathtub. Unlike this lady, the person who gets stuck
is taking a bath and is either large or is in a small RV bathtub. In either
case, their body presses against the tub and squeezes the water away
from their body. All of sudden they feel hundreds of pounds heavier and
are being held down against the bathtub, and they can't get up. What is
happening?
#4: I do this demo with a big suction cup
(dent puller) in my traditional classroom, except I use a bigger table
and don't lift it as high. But the question is the same. Who or what is
lifting this table? And where exactly is the location of the lifting force?
