Energy- is a conserved substance like quality with the ability to cause change.
  • The only form of energy is plasma
  • There is only size in energy, no direction
  • able to cause change
  • exists in many forms
  • Distinguish between internal and external transformations
  • Can be used without a complete understanding
  • The more concentrated the energy is, the easier it is to use
  • It takes energy to harness energy
  • A system is a part of the universe that is being concentrated
  • An environment is everything outside the system
  • Potential Energy- Due to position or configuration.
  • Gravitational Potential (Eg)
  • Elastic Potential (Eel)
  • Kinetic Energy (Ek)
  • Due to motion
  • Internal Energy (Eint), also called Dissipated Energy (Ediss)
  • Mostly heat
  • Energy is measured in Joules(J)
  • oExample- If you put your hand on a heated stove, you would feel the heat. The heat is a form of internal energy.

Initial name middle/end








LOL

Screen_shot_2012-05-06_at_6.06.57_PM.png




Transfer of Energy: When energy is taken out/put into a system (the "O" part of your LOL diagram), it is called working. The "o' part of your lol diagram tells us what your system is and if there is working on the system. Working is the change in energy or a parallel force times the displacement. Working = ∆Energy = Force ǁ · ∆X Energy changes forms, but cannot be created or destroyed (Law of Conservation of Energy).
EX: For instance, if a 4kg object was held 1.5m in the air, then the object would have 60J of energy. When the object is released, Eg (potential gravitational energy) changes into Ek (kinetic energy). As the object falls towards the earth, Eg decreases and Ek increases.

Working: When an object gains or loses energy, it's called working. This is denoted by an arrow pointing in or out of the "O" in the diagram. Working is the change in energy and is measured in Joules.
EX: A bullet strikes a block of wood which exerts, on average, a force of 50,000N opposing the motion of the bullet. What is working if the velocity is 350m/s and mass is 25g?
Formulas: W = Force ǁ · ∆X; Ek = 0.5mv²
Ek = 0.5 (0.025) 350²
Ek = 1531.25J
Ediss (Working) = 1531.25J
*Note: You must convert grams to kilograms because the formula is made for that unit. All of the initial kinetic energy is converted to internal energy through working. (Ek--> Eint)

Power: With working you can calculate the power. The equation for Power is P = working / time. It's measured in watts like in a light bulb.
EX: If Kim and Jim work for UPS and Kim can lift a 120kg package in 3 seconds and Jim can lift a 150kg package in 4 seconds (both lift it 1 meter), which exerts more power?
Kim-->
P = working / time
P = (F ǁ · ∆X) / time
P = (Fg · ∆X) / time
P = (m · g · ∆X) / time
P = (120 · 10 · 1) / 3
P = 400watts

Jim-->
P = working / time
P = (F ǁ · ∆X) / time
P = (Fg · ∆X) / time
P = (m · g · ∆X) / time
P = (150 · 10 · 1) / 4
P = 375 watts

Answer: Kim exerted more power lifting the box.

Bob and Fred's Energy 2.0




1sycs.JPG
1sycs.JPG



In this experiment we show that energy is neither lost nor created and that the E-k of the duct-tape is changed into E-int, but the total amount of energy stayed the same throughout the experiment.