obtaining food

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Obtaining Food. Life can be thought of as solar- powered All energy comes from the sun. Potential and Kinetic Energy. Kinetic Energy. Potential Energy. Elastic Potential Energy. Gravitation Potential Energy. Chemical Potential Energy. How is all energy divided?. All Energy. - PowerPoint PPT Presentation


Obtaining Food

Obtaining FoodLife can be thought of as solar- poweredAll energy comes from the sun

Potential and Kinetic Energy

How is all energy divided? PotentialEnergyKineticEnergyAll EnergyGravitationPotentialEnergyElasticPotentialEnergyChemicalPotentialEnergyWhat is Potential Energy?Energy that is stored and waiting to be used later

What is Gravitational Potential Energy?Potential energy due to an objects position

P.E. = mass x height x gravity

Dont look down, Rover!Good boy!What is Elastic Potential Energy?Potential energy due compression or expansion of an elastic object.

Notice the ball compressingand expanding

What is Chemical Potential Energy?Potential energy stored within the chemical bonds of an object

What is Kinetic Energy?Energy an object has due to its motionK.E. = .5(mass x speed2)

AutotrophsGreek for self feeder (make their own food)Also called producersUse sunlight and CO2 to make glucoseCalled photosynthesisOn land :plantsIn water: algae

HeterotrophsGreek for other eatersMust eat producers for energy

Harvesting energy in foodWe use food to make energy through cellular respirationUse oxygen and sugar to make energy in the form of ATP

Plants use sunlight to make energy through photosynthesisUse CO2 and water to convert sunlight into chemical energyThe two processes are related!!! We need plants and plants need us.

Before the energy can be used, it is first transformed into a form which the organism can handle easily. This special carrier of energy is the molecule adenosine triphosphate, or ATP. Its Structure The ATP molecule is composed of three components. At the center is a sugar molecule, ribose (the same sugar that forms the basis of RNA). Attached to one side of this is a base (a group consisting of linked rings of carbon and nitrogen atoms); in this case the base is adenine. The other side of the sugar is attached to a string of phosphate groups. These phosphates are the key to the activity of ATP. ATPMade in the _______________________.Adenosine TriphosphateA currency for cells to convert food into a usable energy source.Think a $100 bill is glucose and ATP is a $1 bill. It is easiest to use the $1

Types of energyEnergy- the ability to perform work

Potential stored energy/ energy of locationChemical energy- how much work the molecules can do is dependant on how the molecules are arranged.Carbs, lipids, proteins have structures that make them rich in energy

Chemical energy is the energy that is available for release in chemical reactions

Kinetic- energy of motionThermal energy- random molecular motion


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