DiscoverED Covering topics such as earth, animals, technology, water, biology, chemistry and space, these science lesson plans and activities are perfect for teaching students the basics of science. Challenge kids from an elementary to high school level with science activities that they will enjoy.
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In one of the handson investigations, as part of Discovered program, we had
a fun activity that models the circulatory system of the human body. This is a
learning from teaching that particular investigation.
Models are an excellent tool to teach science. But not all models are exact
replicas of the system that is being explained. science experiments in primary school
Even though every model requires a certain degree of abstract relation
between the components of the model and the components of the system,
each of them would have a slightly different level of abstraction.
1. For example , a physical model of the eye would have convincing
similarity to the way a real eye looks. If it is a scale model then there is
similarity in proportions of the original system [eye] and the model
2. But when we use the model to talk about how the lens in the eye works,
it requires a bit of imagination to see how the lens of the eye changes
its shape using the lens in the physical model [That does not actually
show the change in lens shape of eye.
3. If we talk about how the lens helps in focusing the image on the retina,
the physical model is not much help as the person has to imagine how
the lens would work and how the image is focussed onto the retina.
The same model has increasingly higher levels of abstraction required
by the learner in the 2 and 3rd example. This is because the comparison
between the model and the original phenomena is not similar.
The working of lens in the eye could be better explained using a drop of water
and how its focal point changes when it is stretched. The thicker the water
drop, the more different the image. This changes much like the lens in the
eye. This requires less effort by the learner to relate both phenomena. science
experiment for kids at school
4. Similarly, for explaining the way image is focussed on the retina, we
could use a convex lens on an optical bench to focus a picture on a white
screen. This is far easier for the learner to relate to than just explaining
about focus using a clay physical model of the eye.
5. Thus, I believe when designing a model for use in a classroom, one must
keep this abstraction minimal. But the discussion is open.