Energi dan Perubahannya | Proyek IPAS SMK Kelas X

Summary of scientific concepts, discoveries, and phenomena

Energy and metabolism

• Food provides energy; in the body, it is converted into usable energy via metabolism.
• Energy is also needed for physical motion (e.g., humans moving objects and vehicles needing energy).

Energy conservation and types

• Law of Conservation of Energy: energy cannot be created or destroyed; it can only change form.
• Energy definition: ability to do work/effort.

Work (effort) in physics

• Work (W) depends on force (F) and displacement (s):
  • If force is in the same direction as displacement:
    • W = F × s
• Because force is a vector, direction matters:
  • With an angle θ between force and displacement:
    • W = F × s × cos(θ)
• Units (as stated):
  • Work: Joule (J)
  • Force: Newton (N)
  • Displacement: meter (m)

Mechanical energy and conservation

• Mechanical energy conservation (isolated system): If only conservative forces do work, then potential + kinetic energy remains constant.

• Relationship:

  • Eₘ = Eₚ + Eₖ (mechanical = potential + kinetic)

Potential energy (position-based)

• Eₚ = m × g × h
  • m: mass
  • g: gravitational acceleration
  • h: height

Kinetic energy (motion-based)

• Eₖ = (1/2) × m × v²
  • v: speed

Forms of energy

Heat energy

• Related to temperature increase.
• Microscopic source: interactions among atoms, molecules, or electrons.
• Examples:
  • Electric stove heating (electron interaction)
  • Burning candle heating (hydrocarbon + oxygen)

Electrical energy

• Energy due to electric charge, whether charge is flowing or not.
• Electrical potential energy (static charge): W = Q × V
  • Q: charge (Coulomb implied)
  • V: voltage (Volt)
• Energy in a circuit (with current): W = I² × R × t
  • I: current
  • R: resistance
  • t: time

Chemical energy

• Stored in chemicals and released/absorbed in chemical reactions.
• Examples: food, fuel, accumulators, batteries.
• Thermally characterized by system temperature change:
  • Endothermic: absorbs heat → temperature increases
  • Exothermic: releases heat → temperature decreases

Nuclear energy

• Released from interactions of atomic nuclei during radioactive decay.
• Radioactive materials decay into more stable forms by emitting:
  • alpha (α), beta (β), gamma (γ) radiation
• Examples/sources named: Uranium-235 and Lutetium-239 (as stated).

Energy sources: renewable vs non-renewable

• Non-renewable energy sources (limited availability):
  • petroleum, coal, nuclear energy
• Renewable/alternative energy sources (available abundantly):
  • sun, water, wind, bioenergy

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Listed / methodology-style processes

Petroleum (crude oil) processing (multi-stage approach)

Primary processing (initial processing)

• Multistage distillation (repeated distillation based on differences in boiling points/fractions)
• Named fractions/products (as stated):
  • LPG
  • Naphtha → processed into “premium”
  • Kerosene / “kerosene and jet fuel”
  • Diesel (diesel engine fuel)
  • Remaining fraction → asphalt and wax

Secondary processing (advanced processes from distillation outputs)

• Cracking (includes: alkylation, polymerization, reformation, isomerization—mentioned as part of cracking activities)
• Extraction (cleaning with a solvent to improve quality)
• Crystallization (separating products by melting points)
• Triting / treatment (cleaning impurities using sodium hydroxide, clay, or hydrogenation)

Coal processing (three stages)

1. Preparation: reduce coal grain size
2. Separation / concentration: separate coal from impurities
3. Coking / watering (as written): separate liquids and solids

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Energy changes (conversion examples)

• Mechanical → other forms
  • Generators: AC generators and DC generators
  • Function described: converting kinetic energy into electrical energy
• Chemical → electrical/other
  • Batteries (including “battery stones” as written)
• Electrical → other
  • Electric motors, electric lights, electric heaters

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Researchers or sources featured

• No specific researchers or credited scientific sources are named in the subtitles.