Bedienungsanleitung Knex 78620 - Education Intro to Wheels and Axles and Inclined Planes Teachers Guide (Seite 13 von 49) (Englisch)

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Lesson�2:�The�Well

Teacher’s Notes

The K’NEX Well model works best

if placed between two desks so the

children can raise or lower the bucket

from the floor. A book should be

placed on each side of the model’s

base to hold it firmly in place. (See

Page 3 of the Building Instructions.)

 • Askeachgrouptorecordtheirobservations,todraw

and label the different parts of their K’NEX Well

mechanism and to explain how it works.

Write the children’s results on the board and discuss

their findings.

* How many turns of the handle are needed to raise

the bucket from the floor?

* Whatever the children count.

Whole Class

 •Askthechildrentolookatthedrawingofthe‘bigaxle’

and ‘small axle’ on Page 3 of the K’NEX Building

Instructions booklet. Do they think the differences in

axle size might make it easier or harder to raise the

bucket containing the 200g mass?

 • Askthechildrentoexplaintheiranswers

using ‘because…’

You may find it useful to write the

activities on the board as a reference

for later class discussions.

Whole Class

 •Discusswiththeclasswhetherornottheirinitial

thoughts were right.

 •Askchildrenfromdifferentgroupstopresenttheir

findings. Encourage them to talk about and discuss

their results.

Instead of talking about big and small

axles you may wish to introduce other

ways of describing relative sizes of

circles using terms such as radius,

diameter and circumference, if

appropriate. The children should have

discovered that with the larger axle it

takes about 5-7 turns of the handle

to raise the bucket from the floor to

the desktop.

With the small axle it takes about 20

– 22 turns to raise the ‘bucket’ to the

desktop. Although many more turns

of the handle were required, using

the small axle makes it easier to raise

the ‘bucket’.

Working in Groups of 2-3

Investigating the answers:

 •Askthechildrentorepeattheirearlieractivityusingthe

‘big axle.’ They should begin with the blue Rod facing

up and they should turn the wheel all the way around to

lift the bucket. Ask them to record:

   •Thenumberofturnsofthehandlethatare

needed to raise the ‘bucket’ from the floor.

Each time the blue Rod faces up, one full turn

of the handle has been completed.

   •Howfastthebucketrises.

   •Howeasyordifficultitistoturnthehandle.

 •Repeattheinvestigationusingthe‘small’axle.They

should remove the yellow Rods from the axle and

attach the string to the red Rod that now forms

the axle.

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