NATURAL SCIENCE AND TECHNOLOGY FOR THE CLASSROOM 2
PORTFOLIO (Assignment 04) Answers
ASSIGNMENT DUE DATE: 08 October 2024
ASSIGNMENT TOTAL MARKS: 100
All answers are available in this document
QUESTION 1: Energy Basics [18 marks]
1.1 Different forms of energy with examples (14 marks):
1. Kinetic energy: The energy of motion.
Example: A moving car or a rolling ball.
2. Potential energy: Stored energy due to position or configuration.
Example: A stretched rubber band or water behind a dam.
3. Thermal energy: Energy related to the temperature of matter.
Example: The heat from a stove or the warmth of the sun.
4. Chemical energy: Energy stored in chemical bonds.
Example: The energy in food or fossil fuels.
5. Electrical energy: Energy from electric charges.
Example: The power in electrical outlets or lightning.
6. Light energy: Energy carried by electromagnetic waves in the visible spectrum.
, Example: Sunlight or light from a lamp.
7. Sound energy: Energy transmitted through vibrations in a medium.
Example: Music from speakers or thunder.
1.2 Energy transformation (4 marks):
Energy transformation is the process of converting one form of energy into another.
Examples include:
1. Chemical to electrical: A battery converting chemical energy to electrical energy.
2. Kinetic to electrical: A wind turbine converting wind's kinetic energy to electricity.
3. Light to chemical: Plants converting sunlight to chemical energy through
photosynthesis.
QUESTION 2: Renewable and Non-Renewable Energy Sources [18 Marks]
2.1 Comparison of renewable and non-renewable energy sources (6 marks):
Availability:
- Renewable: Continually replenished, theoretically unlimited.
- Non-renewable: Finite resources, eventually depleted.
Environmental impact:
- Renewable: Generally lower environmental impact, reduced emissions.
- Non-renewable: Often higher environmental impact, increased emissions.
Sustainability:
- Renewable: More sustainable long-term option.
- Non-renewable: Less sustainable, finite supply.
PORTFOLIO (Assignment 04) Answers
ASSIGNMENT DUE DATE: 08 October 2024
ASSIGNMENT TOTAL MARKS: 100
All answers are available in this document
QUESTION 1: Energy Basics [18 marks]
1.1 Different forms of energy with examples (14 marks):
1. Kinetic energy: The energy of motion.
Example: A moving car or a rolling ball.
2. Potential energy: Stored energy due to position or configuration.
Example: A stretched rubber band or water behind a dam.
3. Thermal energy: Energy related to the temperature of matter.
Example: The heat from a stove or the warmth of the sun.
4. Chemical energy: Energy stored in chemical bonds.
Example: The energy in food or fossil fuels.
5. Electrical energy: Energy from electric charges.
Example: The power in electrical outlets or lightning.
6. Light energy: Energy carried by electromagnetic waves in the visible spectrum.
, Example: Sunlight or light from a lamp.
7. Sound energy: Energy transmitted through vibrations in a medium.
Example: Music from speakers or thunder.
1.2 Energy transformation (4 marks):
Energy transformation is the process of converting one form of energy into another.
Examples include:
1. Chemical to electrical: A battery converting chemical energy to electrical energy.
2. Kinetic to electrical: A wind turbine converting wind's kinetic energy to electricity.
3. Light to chemical: Plants converting sunlight to chemical energy through
photosynthesis.
QUESTION 2: Renewable and Non-Renewable Energy Sources [18 Marks]
2.1 Comparison of renewable and non-renewable energy sources (6 marks):
Availability:
- Renewable: Continually replenished, theoretically unlimited.
- Non-renewable: Finite resources, eventually depleted.
Environmental impact:
- Renewable: Generally lower environmental impact, reduced emissions.
- Non-renewable: Often higher environmental impact, increased emissions.
Sustainability:
- Renewable: More sustainable long-term option.
- Non-renewable: Less sustainable, finite supply.
