8
Rotate the model 90 degrees. Attach the
pendulum with the angled pivot post to pegs
7
and
8
as shown.
9
Rotate the model 180 degrees. Attach the
centripetal force funnel to pegs
9
and
9
.
10
Hang the collection cup on the edge of the
base, under the centripetal force funnel.
Adjust all the tracks and stunts so that, in
your best estimation, a gumball will travel
all the way from the dispenser down to
the collection cup. Place a gumball in the
momentum trap. It is optional to start with
a gumball or two in the tip-over tube. The
assembly is finished!
Now it’s time to test the setup!
11
Follow steps 8 through 11 on page 10 like
you did for the first setup.
12
After a run, return the gumball to the globe
each time by taking the collection cup and
dumping it into the globe funnel.
› › › SETUP 3
9
10
8
WHAT’S HAPPENING
The tracks and stunts function similar to how
they did in the previous setups. The new elements
in this setup are the friction track and the
pendulum. The friction track slows the gumball
down. You might notice the gumball makes
more sound when it goes down the friction
track. The pendulum swings over and drops a
gumball into the centripetal force funnel. You
might also notice that gumballs don’t always
roll out of the variable-slope track after being
dumped there from the tip-over tube. This is
because the track has a low slope. Try raising
the track holder to peg
6
to increase the
slope and observing what happens. Refer to
the physics explanations on pages 4–7.
Design your own!
Now that you know how all the
parts of the gumball machine system work, you can
design, build, and test your own configurations.
As a challenge, can you make a gumball machine in
which the gumballs make it to the bottom every single
time they are dispensed?
Done!
90°
7
8
180°
9
9
16
