Vocabulary
the ability to do work
energy
Potential energy is
a. movement energy
b. noise energy
c. stored energy
c. stored energy
An electric fan produces what type of waste energy?
sound
How can a roller coaster gain potential energy?
Go higher
The biggest source of light energy
Sun
The energy of motion
Kinetic energy
If you imagine a drop of water about to fall down a waterfall, at the top of the waterfall the drop of water has this kind of energy.
Potential Energy
What is the useful and waste energy you get from an electric drill?
useful - kinetic
waste - sound, heat
a light bulb converts electrical energy into which of the following energy?
light only
heat and light
heat only
light and motion
heat and light
The amount of _______ energy an object has depends on its speed and mass.
kinetic
Energy changing from one form to another.
Energy transformation
This type of energy is present in a battery.
Chemical potential energy
How do you calculate energy efficiency?
=useful output/input x 100
What energy CHANGE takes place when someone plugs a radio into an electrical outlet?
light energy changes to sound energy
sound energy changes into electrical energy
electrical energy changes into sound energy
chemical energy changes into sound energy
Electrical energy changes into sound energy
Is energy ever lost in an energy transformation?
No, but it can be transformed into waste energy
Units for Energy
Which situation has the most kinetic energy?
A match before it is lit
A match while it is burning
When something is more energy efficient you get more _______ for the same amount of energy.
work
What energy transformation takes place when someone releases an arrow from a bow?
elastic potential to kinetic energy
Name 5 forms of energy
thermal energy, sound energy, light (or solar or radiant or electromagnetic) energy, electrical energy, kinetic energy, potential energy, chemical energy, nuclear energy, etc.
The Law of Conservation of Energy states that energy is never created or destroyed, it is only ________ from one form to another.
changed
Is sound energy kinetic or potential?
kinetic
A TV uses 850J of energy per second, 240J is transformed to light and 310J transformed into sound. How much is transformed into waste energy?
300J
A toaster transforms _____ energy to _____ energy
electrical, thermal
How many joules does it take to lift a 100g mass one metre?
One joule