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NST1502 PORTFOLIO (ASSIGNMENT 4) 2024

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This document contains answers for NST1602 portfolio assignment 4 for the academic year 2024. All answers are available in the document. All the best and please give us a review!!!

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  • October 6, 2024
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  • 2024/2025
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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.

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