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DNA (Do Now Activtiy) aka bellringer

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DNA (DO NOW ACTIVTIY) AKA BELLRINGER Try to, in your own words, define energy ENERGY + THE LAWS OF THERMODYNAMICS FORMS OF ENERGY KINETIC Electrical Thermal (heat ... – PowerPoint PPT presentation

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Title: DNA (Do Now Activtiy) aka bellringer


1
DNA (Do Now Activtiy) aka bellringer
  • Try to, in your own words, define energy

2
Energy The Laws of Thermodynamics
3
Forms of Energy
  • Potential
  • Kinetic
  • Electrical
  • Thermal (heat)
  • Light
  • Motion
  • Sound
  • Chemical
  • Gravitational (height)
  • Elastic
  • Nuclear

4
Energy is not created or destroyed
  • The amount of energy in the universe is finite,
    though it is a very large amount, and constant
  • Energy can change forms. I.e. an electric fan
    converts electrical energy into the kinetic
    energy of the fan moving.
  • Objects can exchange energy with their
    surroundings (recall that this is one of the
    definitions of being alive)

5
Example
6
Energy in living things is transferred by atp
  • Energy transfer molecule
  • We convert energy in food into ATP, which can
    then carry energy to where it is needed

 
7
ATP
8
Energy Coupling
  • In the body, endothermic and exothermic reactions
    are often connected, so that the energy released
    from one reaction can drive another reaction

9
Any Time energy changes forms, some energy is
lost from the object
  • The energy is not used up or destroyed, but it
    leaves the object as heat
  • The same is true of chemical reactions, there is
    always some energy lost to surroundings as heat

10
Every chemical reaction loses energy as heat
  • I.e. when we make a protein from amino acids, we
    lose some energy
  • This energy can no longer be used for work

11
So Whats the point?????
  • In everything we do, we lose energy as heat
  • So we need an energy input
  • So we eat food

12
Cellular Respiration
  • We convert the chemical energy in food into ATP
  • The ATP can then be used to do work
  • Examples of work
  • Flex a muscle
  • Cause a chemical reaction
  • Active transport of a molecule

13
But where does the energy in food come from?
  • Photosynthesis
  • Plants convert light energy into chemical energy
    (food)
  • Or animals convert plants chemical energy into
    chemical energy

14
But where does the energy from sunlight come from?
  • Chemical reactions in the sun release heat and
    light energy
  • At some point the sun will run out of fuel and
    stop releasing energy (but not for a long time)

15
Energy flow of Mr. Mahon throwing a ball
  • Nuclear energy in sun ? light energy ? chemical
    energy in plant ? chemical energy in animal ? ATP
    in animal ? Kinetic energy of arm muscles ?
    Kinetic energy of ball
  • At every single one of these steps, some energy
    is lost as heat (eating really does warm you up)
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