Energy
energy transformation
A change from one form of energy to another; also called an energy conversion.
A hat that weighs 5 newtons is hanging from a hook 1.5 meters above the floor. How much gravitational potential energy does the hat have?
The hat has 7.5 joules.
A girl who weighs 30 kg is inline skating at a speed of 5 m/s. What is the girl's kinetic energy?
The kinetic energy is 375 joules.
law of conservation of energy
The rule that energy cannot be created or destroyed.
The law of __ of energy tells how much energy is present after electromagnetic energy changes to sound.
conservation
Energy can be neither destroyed nor--
created
A stretched rubber band has __ energy.
elastic potential
energy associated with objects that can compressed or stretched
elastic potential energy
Electrical energy is the energy of __.
electric charges
Lightning is a form of __ energy.
electrical
Fusion reactions in the sun change nuclear energy into--
electromagnetic energy
the ability to do work or cause change
energy
A change from one form of energy to another is called an __.
energy transformation
An energy transformation is occurring only at point 3.
false, at all points
the ball has the most kinetic energy as it leaves point 2.
false, point 1
In this example, the law of conservation of energy says that the ball never loses kinetic energy.
false, total energy is same
A mountain climber at the peak has __ energy.
gravitational potential
potential energy related to an object's height
gravitational potential energy
A change in an object's speed has a __ effect on its kinetic energy than a change in its mass.
greater
The gravitational potential energy of an object is equal to its weight multiplied by its--
height
Energy and work are measured in--
joules
To find an object's mechanical energy, you add its--
kinetic and potential energy
the energy an object has due to its motion
kinetic energy
The __ the temperature of an object, the lower its thermal energy.
lower
Your body changes chemical energy into __ energy when you walk upstairs.
mechanical
A form of energy NOT associated with the particles of objects is--
mechanical energy
In a pendulum, a continuous change occurs between kinetic energy and--
potential energy
energy that results from an object's position or shape
potential energy
Mechanical energy is associated with the motion, position, or __ of an object.
shape
Potential energy results from the __ or position of an object.
shape
The kinetic energy of an object is equal to one half its mass multiplied by its speed--
squared
Nuclear fusion reactions occur in--
the sun
Whenever a moving object experiences friction, some of its kinetic energy is changed into __ energy.
thermal
The total potential and kinetic energy of the participles of an object is the object's--
thermal energy
All forms of energy can be __ into other forms of energy.
transferred
Power is the rate at which energy is __.
transferred
When you do work on an object, some of your energy is __ to that object.
transferred
When you use a match to light a candle, multiple __ of energy occur.
transformations
As the ball rises from point 1 to point 3, it slows down.
true
The ball has the most potential energy at point 3.
true
Electromagnetic energy travels through space in the form of __.
waves
Name two forms of energy associated with the particles that make up objects.
Nuclear energy and electromagnetic energy are two forms of energy.
How is power related to energy?
Power is the rate at which energy is transferred, or the amount of energy transferred in a unit of time.
What are the two basic kinds of energy?
The two basic types of energy are kinetic energy and potential energy.
How are work and energy related?
Work is the transfer of energy.
How can you determine an object's mechanical energy?
You can find an object's mechanical energy by adding together the object's kinetic and potential energy.
A baseball in play has its lowest gravitational potential energy--
after it hits the ground
Energy is the ability to do work or cause--
change
