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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
63
Am usement Par k Ex perienc e
5. Can students make a general statement about the area of the circle traced out by the seats on a
s
wing ride that would hold true for any swing ride of similar design?
(For example: Up to the limit of the ride, the faster the ride turns, the larger the circle traced
out by the seats as they spin.)
ACTIVITY 4: WHAT HAPPENS WHEN RIDERS ARE ADDED?
Teacher’s Notes
• The concept of centripetal force is the key in this activity. Centripetal force is a concept that appears
in Grades 9-12 National Science Education Standards, but is not referenced for Grades 5-8.
This information is provided should students ask, since some may have heard of centripetal force
in other contexts.
• Centripetal force is equal to the mass of the object times the square of the velocity, divided by the
radius of the circle.
• In the loop of a roller coaster, the centripetal force keeps the car on the track and the riders in their
seats. It is also the force that keeps the Swing Ride moving in a circular path. The centripetal force is
actually an acceleration toward the center of the circular path.
• Students are often intrigued by questions about where amusement park staff place small and large
riders on the swing ride. Do they put the heavier riders on the inside section of the ride? Do they put
the smaller riders on the outside section of the ride? Will collisions between riders occur as the ride
spins? Will someone collide into me? Misconceptions arise in students’ minds because they are
thinking of the sensations that they feel as the ride turns. The total effect of the forces (centripetal
and gravity) acting on the riders keeps them from crashing into each other so that everyone can ride
safely. Centripetal force working toward the center of the ride and gravity working down toward the
ground keep all of the riders in place.
PROCESS
Whole Class
1. Explain that the purpose of this activity is for students to predict and then test what happens to (a)
the circular path traced by the swings and (b) the speed of the swings when a small mass is added
to the ride.
Teacher’s Notes
• You may want two groups to work
together on this investigation and
exchange their data. One group can
use the Swing Ride model driven by
the red Gear while the other group
uses the direct drive version.
… 65 …


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