Bedienungsanleitung Knex 78620 - Education Intro to Wheels and Axles and Inclined Planes Teachers Guide (Seite 34 von 49) (Englisch)

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wheels and axles and inclined planes

website: www.knexeducation.co.uk

* One measurement is not

enough. The children should

be encouraged to think about

being able to reproduce their

results. At least three readings

should be taken on each test.

* How many measurements they will need to take?

Lesson 5: Ramps

Building Tips

1: To complete Step 7 for the Long Ramp, slide the first

section of the ramp over the yellow Connectors. Then

slip the white joining plate (technical term = biscuit) into

the end of the first section of the ramp. Finally, slide the

second section of ramp over the yellow Connectors and

the joining plate until the gap between the plates is closed.

2: Make sure the children construct both versions of the

model so that the bottom end of the black plastic ramp

touches the desktop. The models are designed to move

an object through the same vertical distance and to ensure

this happens, correct positioning of the black plastic ramp

on the support structure is critical.

 • Askeachgrouptodiscusstheirobservationsand 

results. With the help of labelled diagrams and the

use of correct vocabulary and terminology, they should

describe and explain their findings.

 • Theyshouldincludetheirrecommendationsto

the engineers as to the best type of ramp. Their

recommendation should make use of the

word ‘because…’

Measuring forces: A force meter

can be used to give measurements

in Newtons. If force meters are not

available then heavy-duty elastic

bands could be used. The amount

the elastic band stretches when the

load is pulled up the ramp could give

a non-standard measurement of the

force required to move it.

The weight of the load may have to be

reduced if heavy-duty elastic bands

are not available. A risk assessment on

using elastic bands with specific age

groups should be made first. Please

review the safety recommenda-

tions provided at the beginning of this

Teacher’s Guide.

Measuring height and length:

The children should be encouraged to

observe that the vertical height moved

by the loads in all three cases is the

same, but the distances moved along

the length of the ramps are different.

Protractors also could be used to

measure the slope angles.

They should also note that the least

force (effort) is required to move

the load up the gentle slope but the

load moves the greatest distance.

The vertical lift moves the shortest

distance, but requires the greatest

effort. In both cases the job to be

done is the same.

The use of the ramp reduces the

effort needed to move the load but

that effort must be exerted over a lon-

ger distance. The steeper the

ramp becomes, the greater the

effort needed to move the load, but

the shorter the distance involved.

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