Manual Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide (page 38 of 62) (English)

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Teacher’s Notes

See A Quick Guide to Levers for

additional information.

You may find it useful to draw a

diagram on the board to illustrate

this arrangement.

 •Askeachgrouphowtheymighttestthescissors’

cutting action? Fingers are NOT allowed, even

with plastic.

 •Whereisthestrongestcuttingactionfound?

 •Whereistheweakestcuttingactionfound?

 •Askthechildrentodescribeandexplainverballyand

in written text, how their K’NEX scissors work. They

should be encouraged to use labelled drawings

indicating the positions of the fulcrum, effort and

load and the direction of the applied forces.

Whole Class

 •Showthechildrenaselectionofotherscissor-like

cutting tools with which they may be familiar and which

have a similar cutting action to scissors.

 •Discusshowallthecuttingtoolshavethesamebasic

design but that the design has been modified to make

each of them meet different needs.

  •Foreachcuttingtoolinturnask:

  •Whattypesofmaterialisthistooldesignedtocut?

  •Wouldscissorsbeabletocutthesematerials?

If not, why not?

  •Howdoesthedesignofthiscuttingtoolallowitto

cut materials that scissors cannot?

  •Askthechildrentomakelabelleddrawingsofthe

different types of cutting tools, indicating the position

of the fulcrum, effort and load. They should make

short notes to describe how the design of the cutting

tool fits them for the jobs for which they are used.

You might suggest using thin

rolls of modelling clay/Plasticine

and use the indentation made by

the cutting blades as a possible

measure of the cutting forces

made by the blades.

To promote the wider use and

application of ICT skills and

practices, the children’s models

and work might be recorded using

a digital camera.

Cutting tools with short blades

and long handles are used to cut

difficult materials such as wire or

thick branches. The long handles

help amplify the squeezing force

(effort), while the short blades mean

that the load, or resistance, is near

the fulcrum or hinge. This posi-

tion is where the cutting forces are

greatest. Remind the children about

their investigations when using their

K’NEX scissors to cut modelling

clay.

Hair cutting scissors, on the other

hand, have long blades and short

handles because the main need is

to make long straight cuts. You do

not need a lot of cutting force to

cut through hair.

levers and pulleys

website: www.knexeducation.co.uk

Lesson 6: The Scissors

Education

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Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide Manual

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