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wheels and axles and inclined planes
website: www.knexeducation.co.uk
Lesson 2: The Well
Whole Class
Discuss the children’s experiences.
Teacher’s Notes
In this example, A represents the axle
and B is the handle (wheel). When A
and B are close together, it is difficult
for B to turn the axle. However, the
further B’s hands are placed from the
axle, the easier it is for B to turn it.
Just like a lever in action.
Working in Pairs
 • Askthechildrentotrytheexerciseagain,onlythis
time A, the axle, tries to turn the wheel and B tries to
prevent this.
In the reverse situation, when A (the
axle) is being turned, it is very difficult
for A to make the wheel turn - a large
input turning force must be applied to
the axle to enable the large wheel to
be turned.
Resources:
60cm length of 30mm dowelling
or a broom handle.
 • Askonememberofthepair(A)toextendonearmand
firmly grasp the centre of the dowelling or ruler. The
other member (B) places his/her hands on either side
of A’s hand and tries to turn the length of dowelling
while A tries to stop the turning movement.
 • HowdifficultwasitforAtostoptheturning
movement? How easy was it for B to turn it?
 • ChildBnowplaceshis/herhandsapproximately20cm
from A’s hand and repeats the action.
 • HowdifficultisitforAtostopthemovement?
 • ChildBshouldrepeatedlymovehis/herhandsfurther
away from A until the dowelling turns easily.
 • Thechildrenchangepositionsandrolesandrepeat
the activity.
Education
®
16


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