In this lesson our instructor talks about energy. First, she gives an overview of energy. Then she talks about the two types of energy: potential and kinetic energy. Lastly, she lectures on the law of conservation of energy and renewable/nonrenewable energy resources. Four complete example videos round up this lesson.
Energy is the ability to do
work or to cause change.
Potential energy is stored
energy or energy of position.
Mechanical (elastic) potential
energy, is energy stored in an object by tension, like a spring or
a rubber band.
Chemical potential energy is
energy stored in chemical bonds.
Nuclear energy is the energy
stored in the nucleus of an atom.
Gravitational potential energy
is energy stored in an object’s height. (GPE = mgh)
Kinetic energy is energy of
Thermal energy is energy of
heat, or energy from the movement of atoms or molecules.
Radiant energy is the energy
Electrical energy is the
energy of electrons moving through a wire.
Sound energy is the energy in
the compressional waves of sound
Motion – energy of objects
Law of conservation of energy:
energy cannot be created nor destroyed, only transformed.
Energy resources used to
generate electrical energy are either nonrenewable (fossil fuels,
nuclear) or renewable (solar, wind, geothermal, hydropower, biomass)
Most electricity generating
plants use energy to turn a turbine, which is attached to a
generator that generates electricity.
What type of energy is called the energy of movement of particles in an object or the object itself?
What type of energy is stored energy?
If you drop a penny from a balcony on the second floor, the gravitational potential energy before you drop the penny will be equal to the kinetic energy of the penny just before it hits the ground (ignore the effect of friction for this problem). This is an example of what law?
Law of conservation of energy — the GPE is not lost, but transformed into KE
*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.