Manual Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide (page 32 of 62) (English)

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Teacher’s Notes

The wrist of the hand holding the top

of the ice hockey stick is the fulcrum,

the lower hand provides the effort and

the resistance of object being hit is

the load.

The children may not realise at first that

it is their wrist that is the fulcrum. Their

wrist provides the point of rotation, just

like a door hinge.

 • Introducetheactivitybytellingthechildrentheice

hockey player in the photograph on Page 8 of the

K’NEX Building Instructions needs an improved design

for his hockey stick to help him score more goals. He

knows that he isn’t hitting the puck fast enough but he

is not sure whether he needs to buy a longer or a

shorter hockey stick. The children’s task is to provide

evidence to help him make his decision.

 • TheywillhaveavailableaK’NEXmodelofhisicehockey

stick which they can use to test their ideas.

 • Talkabouthowanicehockeystickisyetanothertype

of lever and that the concepts they learnt in previous

lessons also apply. Review the key points about levers:

  •theyallsharethesamebasicfeatures–arigidbeam

that rotates about a fulcrum, effort and load.

  •whenaheavyobject(load)ispositionedclosetothe

fulcrum, less force (effort) is needed to move it.

Working in Groups of 2-3

 • AskthechildrentofirstbuildtheirK’NEXHockeystick

model, and then investigate, describe and explain how

it works as a lever.

 • UsethephotographonPage8oftheBuilding 

Instructions to observe the position of the

player’s hands.

 • Letthechildrentrythisforthemselvesbyhittingsmall

balls of paper with their K’NEX ice hockey stick.

* Which hand acts as the fulcrum?

* Can you identify exactly which part of that hand

is the fulcrum?

* Which hand provides the effort (the force that

moves the puck)?

* Where is the load?

* The top hand.

* The wrist.

* The lower hand.

* The puck.

Try this:

Working in Groups of 2-3

 • AskonechildtoholdtheirK’NEXicehockeystickand

line it up along the edge of their desktop.

 • Usingonlytheirwrist,theyshouldmovetheicehockey

stick backwards and forwards.

Depending on the flexibility of their

wrists, the head of the ice hockey

stick should move about 4 times

the distance moved by the hand.

Lesson 5: The Ice Hockey Stick

levers and pulleys

website: www.knexeducation.co.uk

Education

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Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide Instructions - German - 62 pages

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Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide Instructions - French - 62 pages

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

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