GR 7 NATURAL SCIENCES study notes for November were compiled by using 2019 – 2021 IMPAQ previous examination papers. The notes are compact, colourful and easy to study – giving possible answers directly from the memorandums. Making it perfect for learners with learning barriers or that struggle...
These notes are compiled from previous exam papers: IMPAQ NOV 2019 – 2022.
These are only suggested answers, as obtained from the memoranda. I encourage you to answer the
calculation/illustration questions without looking at the answers first.
Good luck. Juffrou Ansie
TOPICS
1. Sources of energy
2. Potential and kinetic energy
3. Heat Transfer
4. Insulation and energy saving
4. Energy transfer
5. The National Electricity Grid.
6. Relation of the sun to the Earth
7. Relationship of the Moon to the Earth
8. Development of astronomy
, 2
MULTIPLE CHOICE QUESTIONS
Astronomy The scientific study of space.
Fossil fuel A non-renewable energy sources such as coal, oil and natural
gas
Potential energy The energy stored in the system.
Kinetic energy The energy an object possesses because it is moving.
Good electrical Aluminium, copper and metals.
conductors
Good insulation/insulating building material.
Coal Coal consists mainly of carbon. Coal and gas are used in
South Africa to produce petrol and diesel. About 50% of
coal's available energy is lost in generating electricity.
Crude oil Petrol and diesel are mostly used as fuel for cars, trucks and
motorcycles. They are produced from crude oil, which is a
fossil fuel formed from the remains of dead prehistoric
animals.
Day and nightfall Number of daylight hours equals number of nighttime hours.
Planet A celestial body that moves in orbit around a star.
Nuclear power When the nucleus is broken apart, a huge amount of energy
stations is released. This energy can be used in nuclear power
stations to generate electricity. Uranium is a source of energy
for nuclear power stations.
Moon Earth's only natural satellite
, 3
Joules Energy is measured in this unit.
Sasol The world's largest and first plant that can process coal into
oil.
Low water If the sea has receded far and a lot of sand is visible, it is low
tide.
Insulation Insulation materials can be used to keep an object's
material temperature if we do not want that object to change
temperature. Examples of natural insulators: Plastic,
fiberglass and polystyrene
Output energy ÷ The effectiveness calculation
input energy
Photosynthesis A plant uses the radiant energy of the Sun to make its own
food through the process of photosynthesis
Constellation A constellation is any group of stars that, when observed
from Earth, appears to form a pattern or image in the sky.
Wasted energy "Wasted energy" is lost in the form of heat and/or sound.
The equinoxes Occurs twice a year (around March 20 and September 22)
when the Sun's rays fall directly on the Earth's equator
The gravity The force due to gravity on the surface of the earth is six
times greater than the force due to gravity on the surface of
the moon. The force of gravity depends on two things: Mass
and distance.
0° latitude Equator
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