Forms of Energy
_________ energy is the energy of moving electrons.
Electrical
__________ is the ability to do work; make things move or change.
Energy
When you cook food on the stove, energy is used to change the food. What kind of energy cooks the food?
Thermal (Heat) Energy
Most of the light and heat energy we receive comes from the ________.
sun
Which description has mostly potential energy?
a. a boy sliding down a hill
b. a car driving on the road
c. a cat jumping up on a chair
d. an orange attached to a branch on a tree
d. an orange attached to a branch on a tree
_________ energy travels in waves and allows us to see.
Energy of motion is called ___________ energy.
kinetic
When you turn on a television, what energy transformations are occurring?
electrical energy to light and sound energy
True or False?
Lightning is an example of electrical energy.
True
Which of the following has kinetic energy?
a. a ball sitting on the ground
b. a rubber band pulled back
c. a ball being thrown across a field
d. a person standing outside of a building
c. a ball being thrown across a field
_______ energy is the energy stored in food. We digest the food for energy.
Chemical
Stored energy is called _____________ energy.
potential
What happens when a battery-powered flashlight is turned on?
chemical energy - electrical energy - light energy
True or False?
The law of conservation of energy states that energy cannot be created and destroyed.
True
Which is an example of chemical energy?
a. a ball rolling down a hill
b. an animal digesting food
c. a cup on a table
b. an animal digesting food
_________ energy causes matter to change states.
Thermal (Heat)
The total of potential and kinetic energy is called ____________________ energy.
mechanical
When you rub your hands together on a cold day, you use friction to convert ________ energy to _______ energy.
mechanical energy to thermal (heat) energy
or
chemical energy to mechanical energy to thermal (heat) energy
Pitch is the highness or lowness of a _________.
sound
True or false?
Bats bounce sound waves off of objects to locate them.
True: This process is called echolocation and helps bats know what objects are around them.
_________ energy causes vibrations in matter. These vibrations reach our ears in waves and allow us to hear.
Sound
A mirror ______________ light rays back to your eyes so you can see the image in the mirror.
reflects
Explain how energy changes from one form to another as a rollercoaster car goes from the top of a hill to the bottom and back up the next hill.
As the rollercoaster car is at the top of the hill, it has mostly potential energy based upon its height.
As the rollercoaster car moves down the hill, it loses some potential energy and gains kinetic energy.
At the bottom of the hill, the rollercoaster car has mostly kinetic energy.
Going back up the hill, the rollercoaster car gains potential energy and loses some kinetic energy.
True or false?
Temperature is the measure of sound energy.
false; temperature is the measure of heat energy
_____________ energy can change matter into different states.
thermal (heat)