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Final

PHYSICS 1L03 Final: unit-4-energy-transformations-test-review-lg


Department
Physics
Course Code
PHYSICS 1L03
Professor
Christine Wilson
Study Guide
Final

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Energy Transformations Test Review
LEARNING GOALS - I can:
E1. Evaluate the impact on society and the environment of energy-transformation technologies, and
propose ways to improve the sustainability of one such technology;
E2. Investigate energy transformations and the law of conservation of energy, and solve related
problems;
E3. Demonstrate an understanding of diverse forms of energy, energy transformations, and
efficiency.
1. Energy Forms
-Identify various energy forms
-Write energy transformation equations given a scenario
2. Work - transfer of energy
- Positive work - increases or adds energy to a system
- Negative work - decreases or removes energy froma system
- 3 cases when W = 0: be able to identify these
- Work is calculated for individual forces, not Fnet
dFW
3. Energy - ability to do work
(a) Elastic Potential Energy – energy stored in a stretched or compressed elastic object
Hooke’s Law:
kxF
(b) Kinetic Energy - energy of motion
2
2
1mvEk
(c) Gravitational Potential Energy - stored energy relative to a particular reference position
hmgEg
(d) Mechanical Energy – sum of kinetic and gravitational potential energy
gkmechanical EEE
4. Law of Conservation of Energy - energy in a system is always conserved; energy is neither created
nor destroyed but may be transformed into different forms
When total mechanical energy is conserved:
2
2
1mvhmgE
EEE
mechanical
kgmechanical
5. Thermal Energy and Heat
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