Homework 2
Name____________________________________
The law of conservation of energy states that when one form of energy is transformed to another, no energy is
destroyed in the process. According to the law of conservation of energy, energy cannot be created or destroyed. So the
total amount of energy is the same before and after any transformation.
1. The law of _________________________of energy states total amount of energy is the ___________________
before and after any transformation. All of the original energy will be ______________________for if you add up all
the new forms of energy after a transformation. When one form of energy is transformed to another, no energy
is__________________________ in the process according to the law of conservation of energy. _________________.
Matter
Law
conservation
same
accounted
destroyed
Energy
conversation
used
The six forms of energy are mechanical energy, thermal energy, electrical energy, nuclear energy, chemical energy,
and electromagnetic energy. Mechanical energy is in moving objects like a speeding car or spinning turbine. Mechanical
energy is also the energy in wind and flowing water. High speed winds move the blades of a turbine. The mechanical
energy of the wind is transferred into the blades of the turbine. As the blades spin, their mechanical energy is
converted into electrical energy (a non-mechanical form of energy) and supplied to homes and industries in order to run
electrical appliances. Because the moving wind has mechanical energy (in the form of kinetic energy), it is able to do
work on the blades of the turbine.
1. How does a turbine work?
2. Which of the six kinds of energy moves a turbine?
____3. Which best represents the image? →
a. Mechanical energy →Thermal energy
b. Mechanical energy→ Electrical energy→ Light and Thermal energy
c. Thermal energy→ Electrical Energy→ Mechanical energy
4. Which law states that the amount of energy before a process is the same as
the amount of energy after a process?
5. What does the law of conservation of energy state?____________________________________________________________
___________________________________________________________________________________________________________
___________________________________________________________________________________________________________
6. List the six forms of energy.
1._____________________________
4._____________________________
2.__________________________
5.__________________________
3._____________________________
6._____________________________
Energy is the ability to do work or cause change. As work is done energy is transferred from one object to the other.
Kinetic energy is the energy the object has because of its motion. Objects must be moving to have kinetic energy.
Kinetic increases with speed because kinetic energy is the energy of motion. Potential energy is stored energy or energy
that has not been used. Potential energy from gravity is the energy an object has because of its height or amount.
Kinetic Energy
Potential Energy
1.
1.
2.
2.
3.
4. What kind of energy does the
motor cycle have? Explain ↓
3.
5. In the pendulum→, which point
has the most potential energy?
6. In the pendulum→, which point
has the most kinetic energy?
An archer gives potential energy to a bow by pulling it back. THINGS DO NOT NEED TO BE MOVING TO HAVE
POTENTIAL ENERGY! Most examples of potential energy are in objects that are not moving.
In the images below show a skier on top of the hill and half way down the hill. In the process of going from the top to the half way
point, ½ of the potential energy is converted into kinetic energy. The Law of Conservation of ENERGY says that the amount energy
before a process is the same as the amount of energy after a process. So the total energy (TME) does not change.
Half potential energy PE
& half kinetic energy
All potential energy PE
1.
3.
Shade the PE bar meter above.
Shade the TME meter above (KE +PE=TME).
2. Shade the KE and PE bar meters above.
4. Shade the TME meter above (KE +PE=TME).
Across
1. stored energy
3. a type of energy from moving electric charges (electricity)
4. Energy store in the core or nucleus of atoms.
5. a type of energy associated with the movement of molecules in an object(heat)
8. energy in motion
Down
2. energy in light (roygbiv)
6. a type of energy associated with the movement of an object
7. a type of energy stored in the chemical bonds that hold compounds
together in an object.
*stored energy
* energy in motion
* a type of energy associated with the movement of an object
*a type of energy associated with the movement of molecules
in an object(heat)
* a type of energy stored in the chemical bonds that hold
compounds together in an object.
*a type of energy from moving electric charges (electricity)
* energy in light (roygbiv)
*Energy store in the core or nucleus of atoms.