Types of KE
Energy caused by the motion of atoms
Thermal Energy
Energy is stored when a object is compressed or stretched.
Elastic Energy
Calculate the KE of the following: KE= 0.5 (m) (v2)
M-20kg
V= 10 m/s
KE= 0.5 (m) (v2)
.5 x (20) x (100)
KE = 1,000 J
Mass = 20kg
Height = 20 m
(20)(9.8)(20) = 3,920 j
When you shout at the teacher, you should be beaten but explaining that you where simply changing mechanical energy into _________ energy, may save you. (doubtful, but it might.)
Mechanical transforms into sound waves.
Energy that travels in an electromagnetic wave, such as light, x rays, wifi
Radiant Energy
Energy is stored in the nucleus of an atom
Nuclear Energy
Calculate KE
M= 10kg
v= 10 m/s
KE = 500 J
Mass 30kg
height 100 meters
(30) (9.8) (100) = 29,400 j
At a power plant nearby, matter is changed into energy to produce this form of energy.
Nuclear, which in turn is transformed into electrical.
Energy caused by the motion of electrons through a conductor
Electrical Energy
True or False:
Nuclear Fusion requires a great deal of energy, allows particles to come together rather than splitting, and gives off a tremendous amount of energy.
True.
Fission is the opposite and rarely used.
Steve travels at a speed of 5 m/s and weighs 50kg, what is his potential energy?
KE = 0.5 (50) (25)
KE = 25 x 25
KE = 625J
Khloe is 40kg and jumps of chimney Rock into Lake Martin. She knows the cliff is 30 meters heigh and wants to know her GPE. What is it?
(40) (9.8) (30) = 11,760 j
Mechanical energy is the amount of kinetic and potential energy in a system. What is the main difference between potential energy and kinetic energy?
Kinetic is motion
Potential is stored
What type of energy travels in longitudinal waves causing vibrations?
Sound Energy
Energy stored in the object due to its position relative to the earth is called what?
Gravitational Energy
Ke?
M= 2,000 kg
V = 100 m/s
.5 (2,000)(1002)
(1,000)(10,000)
KE= 10,000,000 J
Coach Fawcett is big and fat weighing in at a small mass of 105kg. He jumps off the diving board at a height of 30 meters and the wave of water splashes the entire crowd making them screech and cry out like little girls. Coach Fawcett looks over the crowd and exclaims triumphantly that it is just science in motion. "what's his GPE?"
(105) (9.8) (30) = 30,870 j
Longitudinal waves are created by what type of energy?
Sound Energy
Energy due to motion is called what?
Kinetic energy
Chemical, Elastic, and Gravitational energy are the types of potential energy. True or false?
True.
Daxton has curly hair and runs at a speed of 7 m/s despite the hair. He has a weight of 45kg. What is Daxton's KE?
Ke = .5 (45) (72)
Ke = 22.5 (49)
Ke = 1,102.5 J
Mrs.Wittendorf is itty bitty weighing in at a small mass of 45kg. She jumps off the diving board at a height of 30 meters and the wave of water barely makes a splash. She elegantly climbs the ladder out of the water while everyone in the crowd claps in applause . "what's her GPE?"
(45)(9.8)(30) = 13,230 j
Compared to Coach Fawcett, the only thing that changed was the mass.
Where is potential energy greatest on a rollercoaster or a graph?
a) Top
b) bottom
c) middle
a) Top