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 • Discusstheresultsoftheirinvestigationinwhichthey
explored balancing the forces acting on the model. They
should have found that when balanced, the forces on
one side must equal the forces on the opposite side.
 • Askthechildrentomakelabelleddrawingsoftheir
balance model showing the positions of the fulcrum,
effort and load and the directions in which the forces
are acting. They should describe and explain their
observations using appropriate scientific and
technological vocabulary.
Problem solving activity
Children could be set the task of applying their rule to find
the weight of an unknown object using only one 10g mass.
Plenary
Ask some children to describe and explain how they solved
the weighing problem.
Teacher’s Notes
To promote the wider use and
application of ICT skills and practices,
the children’s models and work might
be recorded using a digital camera.
levers and pulleys
website: www.knexeducation.co.uk
Lesson 3: The Balance
Education
®
26


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