Bedienungsanleitung Knex 78620 - Education Intro to Wheels and Axles and Inclined Planes Teachers Guide (Seite 14 von 49) (Englisch)

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wheels and axles and inclined planes

website: www.knexeducation.co.uk

Lesson 2: The Well

Optional Activity

 •Askthechildrentocountthenumberofturnsof

the handle that are needed to raise the ‘bucket’ 10 cm.

They can calculate and compare the distance the

bucket is raised after one turn of the big and

small handles.

 • Iftheaxlesarecircularinsection,thisdistancewillalso

be the axle circumference.

Part 2: Investigating the Forces Used in Lifting

(More suitable for Year 5 and 6 pupils)

Whole Class

 •Askthechildrentoconsiderifusingalonghandlerather

than a short handle will make it easier to raise a load.

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

using ‘because…’

Let’s Investigate!

Working in Groups of 2-3

Investigating the answers:

* Suggest that they change the size of the handle

by using longer and shorter Rods and then repeat

the experiment.

* How do the other Rods compare with the blue Rod?

* Do they make it easier or harder to lift the bucket?

* What is the heaviest load each handle can raise to

the desktop from the floor?

Teacher’s Notes

In both cases the job done is the same

- the ‘bucket’ has been raised to the

same height. With the larger axle, the

‘bucket’ will be raised faster, needs

fewer turns of the handle and requires

more effort. With the small axle, the

‘bucket’ will be raised slowly, needs

many more turns of the handle but

requires much less effort.

The activity is best carried out using

the ‘big axle’ version of the K’NEX

Well model. The handle can be length-

ened or shortened by using different

coloured connecting Rods.

The children should note that the lon-

gest handle makes it much easier

to raise a weighted ‘bucket’ and could

be used for the heaviest loads. They

may even find that when using the

shortest handle, or when simply trying

to turn the axle on its own without a

handle attached, it may not be possible

to raise the ‘bucket’ from the floor, no

matter how hard they try to turn it.

Levers in action

When levers move they pivot around a fixed point – the

fulcrum. Some levers can be made to rotate a full circle, as

with spanners, wrenches and wheels. The well handle works

like a rotating lever whose fulcrum is the centre of the axle.

A long lever makes it easier to move a load because the

effort needed is applied a long way from the fulcrum. Long

handles make it easier to lift heavy loads because they need

less effort to turn them.

See: A Quick Guide to Wheels and

Axles for additional information.

Education

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