# Shared Flashcard Set

Unit 5
Energy
32
Physics
11/01/2012

## Additional Physics Flashcards

Term
 What two things make up the universe?
Definition
 Energy and matter
Term
 What is matter?
Definition
 substance
Term
 What is energy?
Definition
 mover of substance
Term
 What is the equation of work?
Definition
 Work=(Force)(distance)
Term
 Does the path traveled matter for work?
Definition
 HEEEEEEELL NO
Term
 What are the units of work?
Definition
 Juoles
Term
 What is power?
Definition
 Measure of how fast work is done
Term
 What is the equation for power?
Definition
 Power=work/time
Term
 More power=____________________
Definition
 same work, less time
Term
 What is the unit of power?
Definition
 Watts
Term
 How many watts are in one horsepower?
Definition
 1HP=746W
Term
 What is energy?
Definition
 The ability to do work
Term
 What are the units for energy?
Definition
 Joules
Term
 There are ________ forms of energy.
Definition
 many
Term
 There are ________ forms of energy.
Definition
 many
Term
 What is potential energy?
Definition
 Stored energy. Determined by position relative to another object
Term
 What are examples of potential energy?
Definition
 a) stretched rubber bandb) compressed spring
Term
 Is an object that can do work through chemical action an example of potential energy? Why or why not?
Definition
 Yes, due to the position of atoms within the substance.
Term
 What is gravitational potential energy?
Definition
 Potential energy of an object due to an elevated position
Term
 What does gravitational potential energy equal?
Definition
 work done against gravity
Term
 What is the equation for gravitational potential energy?
Definition
 GPE=(mass)(g,acceleration of gravity)(height)
Term
 What is the acceleration of gravity on earth?
Definition
 g=9.8 m/s
Term
 If something does 20 J of work then it has lost __________________.
Definition
 20 J of energy
Term
 What is kinetic energy?
Definition
 energy of motion
Term
 What is the equation for kinetic energy?
Definition
 KE=1/2(mass)(velocity squared)
Term
 What is the law of conservation of energy?
Definition
 "Energy cannot be created or destroyed; it may be transformed into a different form"
Term
 What is a machine?
Definition
 Devices for multiplying or changing directions of force
Term
 What do machines operate on?
Definition
 Law of Conservation of Energy
Term
 What is the idea behind efficiency?
Definition
 Most energy that goes into a machine is comes out as useful work, some is conserved to thermal energy.
Term
 What is the equation for efficiency?
Definition
 Efficiency=Useful Energy Output/Total Energy Input
Term
 What is the work-energy theorem?
Definition
 "Work done is equal to the change in kinetic energy"
Term
 What is the equation for the work energy theorem?
Definition
 (Force)(distance)=1/2(mass)(velocity squared)
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