Energy Vocab
Energy Vocab II
Formulas +
math math math
100
Define Mechanical Energy
What is the total amount of energy in a system
100
Define energy
What is anything that causes change and does work
100
This is the SI unit for energy
What is a joule
100
Calculate the gpe of a baseball with a mass of .4kg that is laying on the ground.
m = .4kg g = 9.8 m/s2 h = 0m gpe? gpe = mgh Gpe = mgh?.4kg X 9.8m/s² X 0m?0 J
200
The type of energy that can compress or expand
What is elastic potential energy
200
The energy of motion
What is kinetic energy
200
This is the formula for GPE
What is gpe = mxgxh or mass x gravity x height
200
A student with a mass of 2 kg is skateboarding on a skate board with a mass of .5 kg. He is traveling at a velocity of 3m/s. What is the KE of the student/skateboard?
m = 2kg + .5 kg; m = 2.5kg v = 3m/s ke= ? Ke = ½ mv²? ½ X 2.5kg X 9m/s ?ke = 11.25 J
300
This type of energy is from heat, or caused by friction
What is thermal energy
300
Define GPE
What is the energy of an object above the surface of the earth
300
This is the formula for kinetic energy
What is ke = ½ X mass X velocity² or 1/2 x mass x velocity squared
300
A bowling ball has a kinetic energy of 60J. The bowling ball has a mass of 15kg. How fast is the bowling ball moving?
given: ke = 60J m = 15kg unknown= V? ke = Ke = ½ mv² 60J = ½ X 15kg v² ?60J = 7.5 v² ?60J/7.5kg = v² ?8m/s = v² ?2.83 m/s
400
Energy stored in food
What is chemical potential energy
400
Define the Law of Conservation of Energy
What is energy is never created or destroyed, it only changes forms.
400
These three factors affect gpe
What is Mass, Gravity and Height
400
A snowglobe has a mechanical energy of 15J. As the snowglobe falls off the table it 10J of its potential energy has been converted into kinetic energy. How much potential energy remains with the snowglobe at this point?
known: ME = 15 J KE = 10 unknown = PE JME = ke + pe ?15J = 10J + pe ?PE = 5 J
500
As a piano fall toward the ground what type of energy transfer is occurring?
What is potential energy is changing into kinetic energy
500
Energy of the sun
What is radiant energy
500
Name a time when an object has both kinetic and potential energy
What is when an object is falling towards the ground, but has not yet hit the ground.
500
A 30kg rock is sitting on a cliff that is 10m high. Suddenly the rock starts to fall. The rock is falling at a velocity of 4m/s. Find the PE and KE for the rock when it is 4 meters off the ground
gpe = mgh ?30kg x 9.8m/s² x 10 m ? gpe= 2940J?? ke = ½ mv² ?½ x 30kg x 64m/s ?ke = 960J ?me = ke + pe? 2940 J = 960J + pe ?-960 J = - 960J ?gpe = 1980J?
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