sci

• ASTRONOMY


  Study of celestial objects, space, and the Universe as a whole
• ASTROLOGY


  Study of movement and position of celestial objects and their supposed influence on us
• STAR FORMATION


  • Nebula
  • Interstellar clouds
  • Collapse under gravity due to mass
• NEBULA


  Interstellar clouds of gas and dust
• CONSTELLATION


  Group of stars that form a recognizable pattern in the night sky
• There are 88 constellations
• ASTERISM


  A recognizable group of stars within a constellation
• 7 MAJOR CONSTELLATIONS


  • Scorpius
  • Cygnus
  • Ursa Major
  • Ursa Minor
  • Cassiopeia
  • Orion
  • Draco
• PROTOSTAR


  Heated core of a collapsing nebula as it begins to form a star
• NUCLEAR FUSION


  1. Occurs in the core of a star

  2. Releases energy that powers the star
• MAIN SEQUENCE


  The longest and most stable stage of a star's life cycle
• STELLAR EVOLUTION


  • Low mass stars
  • High mass stars
• RED GIANT

  1. Hydrogen depletion

  2. Core contracts

  3. Outer layers expand
• PLANETARY NEBULA

  1. Outer layers create a cloud of gas and dust

  2. Around a hot core
• HIGH MASS STAR


  • Gas dust
• RED SUPERGIANT

  1. Star runs out of fuel and gas

  2. Longer than red giant
• SUPERNOVA

  1. Core collapses under its own gravity

  2. Resulting in an explosion
• Mechanical energy


  Energy ability to do work
• Work


  Vector quantity, the product of force and displacement
• Work


  • Upward and right: positive
  • Downward and left: negative
  • There should be displacement
  • Same direction of force and displacement
• Work is considered when there is displacement in the same direction as the force
• Mechanical energy


  The energy that is transferred when work is done
• Types of Mechanical Energy

  • Kinetic Energy
  • Gravitational Potential Energy
  • Elastic Potential Energy
• Kinetic Energy


  Energy of motion, scalar quantity with magnitude but no direction, unit is Joules (J), formula: 1/2 mv^2
• Gravitational Potential Energy


  Function of an object's height, scalar quantity, unit is Joules (J), formula: mgh
• Elastic Potential Energy


  Energy stored in elastic substances or objects, scalar quantity, formula: 1/2 kx^2