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Knex 78890 - Education Amusement Park Experience Teachers Guide Manual

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LESSON 9
9: P
9: P
REDICTING
REDICTING
THE
THE
P
P
ATTERN
ATTERN
OF
OF
R
R
IDES
IDES
www.knexeducation.com
In Groups
2. Groups make their predictions and then undertake their investigation. They should:
a. Place the swing ride back on the butcher paper if it is not there already.
b. Affix a Sharpie
®
marker on one of the outside seats (use a different color for this investigation.)
c. Add one AA battery (or other mass) to the seat where the marker is affixed.
d. Add a second AA battery to the outside seat directly opposite the one on which the first battery
was placed. (See Fig. 2.) The second battery will act to balance the ride so the center section
does not wobble.
e. Test their predictions by comparing (a) the new path traced out when weight was added, with
(b) the path created when there was no additional weight.
Teacher’s Notes
• Batteries are placed on
both outside seats simply
to balance the ride and
make it run more smoothly.
3. Students can find:
a. The circumference of the circle traced when the swing ride is at full speed by determining the
radius of the circle and using the formula: C = 2πr
b. The speed of the swing by using the formula:
speed =
distance
time
4. Ask the students to predict and then test what happens to the circular paths traced by the swings
when one AA battery is placed in an outer seat and two AA batteries are placed in an inner seat.
Will the seats collide?
5. Remind the students that they will need to balance the ride and so will use 6 AA batteries in total.
You may want students to experiment themselves or provide directions for arranging the batteries:
a. Use the butcher paper from previous investigations and a different colored marker or turn the
butcher paper over for this investigation.
Fig. 2
… 66 …


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