Energy
The ability to do work or cause change....
Energy
A change from one form of energy into another is called
an energy transformation.
What type of energy does a spinning turbine have?
Mechanical Energy
An electric motor transforms electrical energy to _____________.
Mechanical Energy
An example of something that stores chemical energy is
Can be any of the following:
Unlit Match
Food
Battery
Gas
Energy is measured in units called
Joules
What type of energy transformation is taking place when natural gas is used to heat water?
Chemical Energy To Thermal Energy
Energy stored in the nucleus of an atom is called
Nuclear Energy
__________________energy, such as ultraviolet radiation, travels in the form of waves.
Electromagnetic (Light or Radiant)
How would you calculate an object’s mechanical energy?
Add its kinetic and potential energies.
Unlike kinetic energy, potential energy is
Stored
When you rub your hands together on a cold day, you use friction to transform
mechanical energy into thermal energy.
A compressed Spring has ______________ energy.
Elastic Potential
Moving water can be used to produce electricity because
all forms of energy can be transformed into other forms.
A man weighing 80 kg is running at a speed of 2.5 m/s. What is the man’s kinetic energy?
KE =1/2 Mass x Velocity2
250 J
The form of energy carried by moving charges is called
Electrical Energy
Which of the following is an example of a continuous transformation between potential and kinetic energy?
A pendulum swinging
If an object has mechanical energy, it can do _____________ on another object.
Work
In a machine, work output is less than work input because some energy is converted into _____________
Thermal Energy
How can you minimize the transfer of thermal energy?
Use an Insulator
DOUBLE JEOPARDY: How does an insulator work to minimize the transfer?
To maintain your body temperature, your body converts chemical potential energy into
Thermal Energy
Explain why a thrown football has both potential and kinetic energy. What is the combined energy called?
The Football has gravitational potential energy because of its position above the ground. It also has kinetic energy due its motion from being thrown. The combined energy is called mechanical energy.
A nuclear reaction in which the nuclei of atoms join together is called nuclear ___________
Fusion
_________________________ energy of a book on a shelf is equal to the work done to lift the book to the shelf.
Gravitational Potential
How high must you lift a 25-newton book for it to have the same increase in potential energy as a 20-newton book that was lifted 0.5 m?
DOUBLE JEOPARDY - SHOW YOUR WORK
PE = Force x Height = Newtons x Meters
Think about making them an equation to solve for X for the height in meters.
Height in Meters = (20 x 0.5) = (25X)
Height = 20 x .5 = 25X
Height = 10 = 25X
Height = 10/25 = X
Height = .4m