# Shared Flashcard Set

## Details

Physics First Chapter 10
Energy Flow and Systems
34
Physics
11/29/2007

Term
 power
Definition
 the rate of doing work or converting energy
Term
 the formula for power
Definition
 Power = Work or energy / time Watts = Joules / seconds Power = m*g*h / time
Term
 another name for a joule
Definition
 newton - meter
Term
 mechanical energy
Definition
 energy an object has due to its motion or position kinetic energy, potential energy, work, stretched rubber band
Term
Definition
Term
 electrical energy
Definition
 carried by the flow of electric current batteries, electrical wall outlets
Term
 chemical energy
Definition
 stored in the bonds between atoms gasoline, food
Term
 nuclear energy
Definition
 results from splitting up large atoms, or from combining small atoms splitting uranium combining hydrogen
Term
 thermal energy
Definition
 heat energy released from burning
Term
 pressure
Definition
 a form of energy in a fluid blowing up a balloon
Term
 open system
Definition
 a system that only counts some forms of energy, or allows energy to come into or go out of a system
Term
 closed system
Definition
 a system in which all forms of energy and matter are counted and none is allowed to enter or leave the system
Term
 energy flow diagram
Definition
 shows the energy conversions that occur in a system
Term
 horsepower
Definition
 a unit of power that is equal to 746 watts
Term
 efficiency
Definition
 the ratio of output energy or power divided by input energy or power the efficiency of a process describes how well energy or power is converted from one form to another all of the efficienies in a system add up to 100%
Term
 thermodynamics
Definition
 the physics of heat
Term
 first law of thermodynamics
Definition
 Law of Conservation of Energy: energy cannot be created or destroyed, only changed from one form to another
Term
 second law of thermodynamics
Definition
 when work is done by heat flowing, the output work is always less than the amount of heat that flows
Term
 how efficient is using gasoline in your car
Definition
 overall, only 36% almost 64% flows out of the car's tailpipe and radiator as waste heat
Term
 Calories
Definition
 the energy in foods measured in kilocalories
Term
 how many joules are in 1 Calorie
Definition
 4,187 joules
Term
 is the energy efficiency of living things high or low
Definition
 quite low most of the energy in food becomes heat, very little becomes physical work
Term
 photosynthesis
Definition
 a process in plants that takes input energy from the sun and creates sugar (a form of chemical energy)
Term
 energy conversion
Definition
 changing the form of energy from one type to another
Term
Definition
 a balance between energy in and energy out so the total energy remains the same
Term
 water cycle
Definition
 the energy flow cycle which describes the phases that water takes energy in is solar energy and energy out is heat energy (air, wind, and weather) causing condensation toprecipitation toground water and rivers toevaporation to condensation, etc.
Term
 food chain
Definition
 a way of describing the energy flow between living things
Term
 producer
Definition
 a plant or one-celled organism that converts energy from the sun into chemical energy in molecules, like sugar
Term
 herbivore
Definition
 gets energy from eating plants
Term
 carnivore
Definition
 gets energy from eating herbivores and other carnivores
Term
 decomposers
Definition
 break down wastes and bodies of other animals into simple molecules that can be used by plants
Term
 omnivore
Definition
 gets energy from eating both plants and animals
Term
 work
Definition
 the energy used to move something the product of applying a force over a distance
Term
 formula for work
Definition
 force * distance = Newtons
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