Manual Knex 78890 - Education Amusement Park Experience Teachers Guide (page 53 of 80) (All languages)

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LESSON 8

8: U

NDERSTANDING

ISPLACEMENT

Am usement Par k Ex perienc e

REVIEW

Your students will be more successful if they have an understanding of the following concepts

and associated vocabulary.

• Multiplication and division of mixed numbers.

• Circumference, radius.

ACTIVITY 1: GEAR STRUCTURE

Students will also have an opportunity to engage in an activity that somewhat demonstrates an optical

illusion. The smaller arms, attached to rods that are supported by larger arms, are of different sizes

and turn at different speeds, which sets up an illusion. Do the slower moving, but larger arms travel

urther during one rotation of the large arms, or do the faster moving, but smaller arms travel further

during one rotation of the large arms? Finally, students will be able to explore the concept of

displacement and should notice striking similarities to their explorations of height on the Ferris Wheel

and Boom Rides (Lesson 6.)

Teacher’s Notes

• The Scrambler seats operate like the beaters on a hand mixer used in a kitchen. For simplicity sake,

the four large arms that support the extensions holding the seats will be known as the large arms.

The smaller arms, (of two different sizes), which hold the seats will be known as the small arms. One

pair of small arms includes yellow Rods and the other pair of small arms includes red Rods.

• Building instructions for this model are found in both the booklet and on the accompanying CD-ROM.

Instructions for the central supporting structure begin on Page 4 (Tower) of the booklet; once this

has been built the ride can be completed by following the instructions provided on Pages 8-11

(Scrambler).

Amusement Park Fact

Some students may notice a major difference between the K’NEX model and a real scrambler ride

at a park. The real ride has three large, arched arms and each of these large arms support four,

rotating arms that, in turn, each hold one seat for two riders. True ride enthusiasts would say the

K’NEX model is like the classic and, today, rarely seen Merry Mixer ride. That ride, like the K’NEX

model, has four large arms each supporting four smaller arms. The Merry Mixer, however, uses cables

to turn the smaller arms while the real-world Scrambler uses a series of gears and rods to operate the

ride. The Scrambler, produced by the Eli Bridge company, made its debut in 1955, while the Merry

Mixer, produced by Garbuck Manufacturing, made its debut in 1960.

PROCESS

Whole Class

1. Explain that gears are unique parts of this amusement park

ride. This particular ride has parts that are “geared-up” and

others that are “geared-down.” When the teeth of the gears

mesh and the gears turn, they transfer force and/or motion.

The larger gear will rotate at a slower rate but with more force.

If a large gear turns a small gear, the small gear will spin faster

but the mechanical advantage of the system will be lower

(less force will be the out come). If a small gear turns a large

gear, the large gear will spin more slowly but the mechanical

advantage of the system will be higher (more force will be

the outcome).

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Knex 78890 - Education Amusement Park Experience Teachers Guide Manual

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