Bedienungsanleitung Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide (Seite 50 von 62) (Englisch)

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Teacher’s Notes

Free photographs can be obtained

from www.freefoto.com and http://pics.

tech4learning.com/

 • Askthechildrentolookatthepicturesofdifferent

sailing boats. Talk about how, regardless of the size of

the sailboat, sailors have always been faced with the

same problem: how to lower and raise heavy sails

safely. In days of large sailing ships sailors had to

climb the masts and literally pull up large, heavy

sails by hand – it was very dangerous work. Modern

sailboats use pulley systems that allow the crew to

raise and lower sails quickly without leaving the

(relative) safety of the deck.

 • Thislessoninvestigateshowpulleyscanbeusedto

lift heavy objects.

 • Askthechildrentocollect/findpicturesoflifting 

machines from books or from research using

the Internet.

 • Discusshowpulleyscanbeusedinanumber

of situations.

 • Allowthechildrentimetoinvestigatephotographsor

illustrations of lifting machines that use pulleys.

 • Whatarethesemachinesusedfor?

 • Howheavyaretheloadstheylift?

 • Isthereanyconnectionbetweenthesizeoftheloads

and the number of pulleys and ropes/cables they use?

Working in Groups of 2-3

 • AskthechildrentoconstructtheK’NEXSailboat

model shown on Pages 12-13 of the Building

Instructions booklet.

Building Tip: Building Steps 6 – 8 will require cooperation

between the members of the group. This applies particularly

to Step 7 when string is attached to the pulleys. Make

sure that one child holds the movable pulley (built in Step 6)

while another carefully threads the string around the

pulley wheels.

Remind the children that they should NOT cut the

string. They will need a long string for several other

pulley activities.

 • Allowtimeforthechildrentoinvestigatehowthesail

mechanism works by lifting a mass attached to the

lower pulley. An opened, large paperclip could be used

as a hook.

Talk about how machines that are

used to lift heavy weights usually

have numerous pulleys in the lifting

mechanisms. The greater the number

of pulleys that are used, the easier it

becomes to lift heavy loads.

In this model pulley system there are

two pulleys, an upper fixed pulley and

a lower movable pulley. Two ropes are

attached to the lower movable pulley.

This arrangement is called a double,

or compound, pulley system.

Fixed pulley

Movable pulley

Lesson 8: The Sailboat

levers and pulleys

website: www.knexeducation.co.uk

Education

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