Exam (elaborations)
NST1502 Assignment 4 PORTFOLIO 2024 - DUE 8 October 2024
- Course
- NST1502 (NST1502)
- Institution
- University Of South Africa
NST1502 Assignment 4 PORTFOLIO 2024 - DUE 8 October 2024 QUESTIONS WITH ANSWERS
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NST1502 Assignment 4PORTFOLIO 2024 - DUE 8
October 2024
QUESTIONS WITH COMPLETE 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 Different Forms of Energy
Energy exists in various forms, and each can be observed in different real-world situations. The
following are some of the key forms of energy:
1. Kinetic Energy
Kinetic energy is the energy of motion. Any object in motion possesses kinetic energy, which
depends on the object's mass and velocity. The formula for calculating kinetic energy is:
KE=12mv2KE = \frac{1}{2} mv^2KE=21mv2 Where:
• mmm = mass of the object
• vvv = velocity of the object
Example: A moving car has kinetic energy because it is in motion. The faster the car moves, the
more kinetic energy it has.
, 2. Potential Energy
Potential energy is stored energy, based on an object’s position or condition. The most common
type of potential energy is gravitational potential energy, which depends on the height of an
object and the force of gravity acting upon it.
Example: A rock resting at the edge of a cliff has gravitational potential energy due to its height
above the ground. If it falls, the potential energy is converted into kinetic energy.
3. Thermal Energy
Thermal energy, also known as heat energy, is the energy that comes from the movement of
particles within a substance. The faster the particles move, the more thermal energy the
substance has.
Example: A cup of hot coffee has more thermal energy than a cup of cold water because the
molecules in the hot coffee are moving faster.
4. Chemical Energy
Chemical energy is stored in the bonds of chemical compounds (molecules and atoms). It is
released or absorbed during chemical reactions.
Example: When gasoline burns in a car engine, the chemical energy stored in the gasoline
molecules is released as heat and converted into kinetic energy to move the car.
5. Electrical Energy
Electrical energy is the energy associated with the movement of electric charges. It powers many
devices and technologies.
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