Exam (elaborations)
NST1502 Assignment 4 PORTFOLIO 2024 - DUE 8 October 2024
- Course
- NST1502 (NST1502)
- Institution
- University Of South Africa (Unisa)
NST1502 Assignment 4 PORTFOLIO 2024 - DUE 8 October 2024 COMPLETE ANSWERS
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NST1502 Assignment 4PORTFOLIO 2024 - DUE 8
October 2024
QUESTIONS WITH ANSWERS
[School]
[Course title]
,NST1502 Assignment 4 PORTFOLIO 2024 - DUE 8 October 2024
QUESTION 1
Energy Basics [18 marks]
1.1 Define and explain the different forms of energy, providing real-world examples for each.
(Focus on the following forms of energy; Kinetic energy; potential energy; thermal energy;
chemical energy; electrical energy, light energy, and sound energy). (14)
1.2 Discuss the concept of energy transformation, giving examples of how one form of energy
can be converted into another. (4)
1.1 Forms of Energy (14 Marks)
Energy is the ability to do work, and it exists in different forms. Here are the main forms of
energy with explanations and real-world examples:
1. Kinetic Energy:
o Definition: Kinetic energy is the energy of motion. Any object that is moving
possesses kinetic energy, which depends on the mass of the object and its velocity.
o Example: A moving car or a thrown baseball. The faster or heavier the object, the
more kinetic energy it has.
2. Potential Energy:
o Definition: Potential energy is the stored energy in an object due to its position or
state. It is energy that has the potential to do work.
, o Example: A stretched bow or a rock perched on top of a hill has gravitational
potential energy due to its position.
3. Thermal Energy:
o Definition: Thermal energy (or heat energy) is the internal energy present in a
system due to the random motion of its molecules. It’s related to temperature; the
hotter an object, the more thermal energy it possesses.
o Example: A cup of hot coffee has thermal energy, and an oven heating food
transfers thermal energy to the food.
4. Chemical Energy:
o Definition: Chemical energy is stored in the bonds of chemical compounds.
When these bonds are broken during chemical reactions, energy is released or
absorbed.
o Example: Food contains chemical energy, which our bodies use to perform work.
Gasoline also contains chemical energy, which is released during combustion in
an engine.
5. Electrical Energy:
o Definition: Electrical energy is the energy carried by moving electrons in an
electric conductor. This is a widely used form of energy in modern technology.
o Example: Powering household appliances like televisions or computers involves
using electrical energy.
6. Light Energy (Radiant Energy):
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