Shared Flashcard Set

Details

Unit 5
Energy
32
Physics
7th Grade
11/01/2012

Additional Physics Flashcards

 


 

Cards

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 band
b) 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)
Supporting users have an ad free experience!