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Inside Collection (Course): Natural Sciences Grade 4
We have to take in food to obtain energy, and eat enough to keep going for long enough. If we do not eat enough, our bodies will not remain warm and we will not have enough energy to do our daily work. To remain healthy, we have to follow a balanced diet. It is possible to know whether you eat correctly and get enough to eat by studying the information on the boxes, packets, bags and tins in which food is bought to find out how much energy per volume is contained in the foodstuff. The quantity that is eaten is measured in kilojoules.
Some of the energy that animals obtain from the food that they eat is stored in their muscles. Those muscles are able to use the energy to do work.
In early times, people used the energy of their own muscles to do work, like gathering food, tilling their fields and building shelters. They made simple implements to help them use this energy more efficiently and to work better. The first tools were made of wood and stone, but when people discovered how to melt down metals, they used metal to make better and stronger tools.
They also discovered that they could use animals to work faster and better and get more work done, as one ox is able to do the work of eight grown men.
Animals were used to transport people and goods, to pull the ploughs in the fields and to pump water from below the ground to irrigate the fields.
Work out a balanced diet by examining the labels on different containers in which food is packed.
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LEARNING OUTCOME 1: SCIENTIFIC INVESTIGATIONS
The learner will be able to act confidently on curiosity about natural phenomena, and to investigate relationships and solve problems in scientific, technological and environmental contexts.
Assessment Standard
We know this when the learner
FOOD AS A SOURCE OF ENERGY
This assignment involves research. Help the learners to plan their research, to collect information, to draw conclusions and to communicate their findings.
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Last edited by Siyavula Uploaders on Mar 10, 2009 12:22 pm -0500.