Energy Flashcards
What is energy that travels through space in the form of waves?
Electromagnetic Energy
An oven converts _____ energy to _____ energy.
Electrical , Heat (Thermal) <— electric
Chemical , Heat (Thermal) <— gas stove
What is the energy of motion?
Kinetic Energy
What is the energy of position?
Potential Energy
What energy is associated with motion and position of objects?
Mechanical Energy
What is energy that is stored in an atoms nucleus?
Nuclear Energy
What is an example of a non-renewable resource?
Fossil fuels (Oil, Natural Gas, Coal)
What are 2 examples of elastic potential energy?
Compressed basketball, stretched rubber band
Energy stored in food would be considered….
Chemical Energy
An example of an energy conversion from kinetic to thermal energy would be…
Friction
Where is kinetic energy the highest?
Lowest part, ground floor
What are 2 ways to increase the kinetic energy of an object?
The faster an object is the more kinetic energy it has.
Doubling the mass increases kinetic energy
Kinetic energy formula?
KE=.5mv^2
Where is potential energy the highest?
The top of the skate. FIRST HIGH JUMP
What are 2 ways to increase the potential energy of an object?
Larger the weight the more potential energy it has.
The further from earths surface the more potential energy it has
What is the formula of Potential Energy?
PE: mgh (g=9.8m/s)
A rock with a mass of 450kg is sitting on a 50m ledge. What is the rocks potential energy?
PE: (50)(9.8)(450)
PE: 220,500J
If a rock with a mass of 800kg was on the same cliff (50m) how would the potential energy change?
PE: (800)(9.8)(50)
PE: 392,000J
392,000-220,500=171,500J
A 5kg object is thrown into the air moving at 3.5m/s. How high will the object go?
KE: (.5)(5kg)(3.5m/s)^2
KE: 30.6J
PE: 30.6J=(5kg)(9.8)(h) divide by 49
30.6/49
H=.62m
Convert 250K to degrees Celsius
250=c+273
-273 -273
C=-23
Convert 15c to kelvin
K=15+273
K=288
How much energy will it take to raise the temperature of 15 grams of water from 20c to 50c? The specific heat of water is 4.18 j/gc
Q=(15g)(4.18j/gc)(30c)
Q= 1881
50-20=30
FINAL SUBTRACT INITIAL
Warming yourself by a fire is an example of energy transfer by?
Thermal Radiation
Burning your hand on a hot object an example of energy transfer by?
Conduction heating
Water inside a pot getting warmer is an example of energy transfer by?
Convection
A material that resists/ limits the flow of heat by conduction, convention, and radiation is an.?
Thermal insulator
Material that allows heat to flow easily?
Conductors
What law states that absolute zero cannot be reached?
Third law of thermodynamics
What law states that energy cannot be created or destroyed?
First law of thermodynamics
What law does energy become less useful as it is converted from one form to another or thermal energy flows from areas of higher temperature to areas of lower temperature?
Second law of thermodynamics
