Energy

• Energy: amount of work and its measured in Joules (J)
• An object may have energy due to its motion or its position
• Conservation of energy: energy cannot be created or destroyed, when work is done, energy is changed from one form to another.
• Energy can be stored
• Kinetic energy is due to motion
• Gravitational energy is from potential to fall
• Chemical energy is in chemical bonds
• Strain energy is compress/stretch
• Nuclear energy is atoms rearranged/split
• Internal energy is motion of molecules
• Electrical energy is carried by electrons
• Light energy is carried in light waves
• Sound energy is carried in sound waves
• What are the types of energy?

  • Kinetic
  • Gravitational
  • Chemical
  • Strain
  • Nuclear
  • Internal
  • Electrical
  • Light
  • Sound
• The formula for kinetic energy is: $Kinetic\ energy\ =$$\ \frac{1}{2}\ x\ Mass\ x\ Velocity^2$ or $\frac{1}{2}mv^2$
• Gravitational Potential Energy =Mass ×Gravity × Height
• Due to the processes through which energy transfers take place not being 100% efficient, energy is lost to the surrounding and therefore energy gets more spread out (dissipated)
• Efficiency = $\frac{Useful\ Energy\ Output}{Energy\ input}\ x\ 100$

  = $\frac{Userful\ Power\ Output}{Power\ input}\ x\ 100$