7.1 Notes

7.1 (slides 1-35)

Things to know before we start:

•The world is full of
energy
•Everything that you do
or see requires or is a
product of energy
•Without energy, living
things could not
survive.

Energy and Work

•Work is the transfer of energy from one
object to another
•Energy is the ability to do work or the
ability to cause a change
•Whenever work is done, energy is
transformed or transferred
•Ex. Whenever you stretch a slingshot back,
you do work and you transfer energy from
your body to the elastic band.

Multiple Choice

Energy can't be .....

• transformed.

• made or destroyed.

• converted.

• harnessed or produced.

Multiple Choice

This is energy that is stored for later use. 

• kinetic energy 

• potential energy 

• mechanical energy 

• electromagnetic energy. 

Energy and Work

•Energy is measured in joules (J).
•Because energy is a measure of the
ability to do work, energy and work are
expressed in the same unit.
•Work requires an object to change its
motion; however, energy can be
present in an object when nothing is
happening at all.

Multiple Choice

What kind of energy is represented in the picture?

• Thermal

• Chemical

• Sound

• Nuclear

Types of Energy

•Mechanical Energy (kinetic & potential)
•Thermal Energy
•Chemical Energy
•Electromagnetic Energy
•Nuclear Energy
•Light Energy
•Sound Energy
•Electrical Energy
•Magnetism

Multiple Choice

What type of energy is being used when riding a bicycle?

• mechanical

• light

• thermal

• sound

Mechanical Energy

•Mechanical energy is the sum of
kinetic and potential energy in an
object that is used to do work.
•In other words, it is energy in an
object due to its motion or position,
or both.

Multiple Choice

Identify the energy form.

• sound

• radiant

• gravitational

• mechanical

Kinetic and Potential Energy

•Kinetic energy is the energy that
a moving object possesses.

•Ex. A hammer pushing in a
nail

•Potential energy is stored energy
due to position.

•Ex. Dynamite before it
explodes
•Has the potential to do work

Multiple Choice

What energy comes from splitting the nucleus of an atom?

• nuclear

• mechanical

• thermal

• radiant

Multiple Choice

Identify the energy form.

• sound

• chemical

• nuclear

• mechanical

Fill in the Blanks

Multiple Choice

Identify the energy form.

• chemical

• nuclear

• radiant

• sound

Fill in the Blanks

Multiple Choice

Energy that comes from humans digesting their food.

• gravitational

• sound

• chemical

• nuclear

Potential Energy

•Gravitational potential energy:

•Energy that is stored by objects
that are above Earth’s surface

•Elastic potential energy:

•Energy stored by an object that
can stretch or shrink

Heat/Thermal Energy

•Results from the motion of
molecules
•Anything that produces
heat is said to have heat
energy.
•Ex. Rubbing your hands
together
•Ex. A heater

•Specific heat is the amount
of heat it takes to increase
the temperature by 1 degree
celsius

• Temperature

– Measure of the

average kinetic
energy of the
particles

Multiple Choice

Identify the energy form.

• thermal

• nuclear

• gravitational

• chemical

ENERGY
TRANSFORMATIONS

Multiple Choice

What energy is demonstrated when a driver honks a car horn to warn other drivers?

• nuclear

• gravitational

• sound

• mechanical

Chemical Energy

•The energy required to
bond atoms together.
•When you break these
bonds, the energy is
released.
•Ex. Digestion
•Ex. When a car burns
gasoline

Multiple Choice

What kind of energy?

• Thermal

• Electrical

• Mechanical

• Light

Electromagnetic Energy

•Energy that comes from
space (waves)
•Ex. The sun’s rays
producing light, X-rays,
and UV rays.
•Ex. Asphalt on a hot
summer day is hotter
where the light shines.
•We will talk about this
more during Unit 8

Multiple Choice

What kind of energy is represented in this picture?

• Thermal

• Chemical

• Electrical

• Sound

Nuclear Energy

•This energy is derived
from the forces that holds
atoms together

•2 types of Nuclear Energy

•Fission - atoms breaking
apart
•Fusion - atoms coming
together
•Happens in stars

Multiple Choice

Energy due to an object's position.

• kinetic

• electrical

• potential

• chemical

Electrical Energy

•Moving electrons through a wire
•Ex. Outlets, tv’s, lights,
lightning

Multiple Choice

What kind of energy does this device use?

• Chemical

• Electrical

• Radiant

• Mechanical

Sound Energy

•Energy that is transferred via
sound waves
•Ex. Music, noise

Multiple Choice

What type of energy is seen here?

• chemical energy

• radiant energy

• mechanical energy

• atomic energy

Light Energy

•Anything that produces light
•Ex. Lightning, sparklers, fireworks

Multiple Choice

Energy stored in chemical bonds like food fuel, and batteries

• Sound Energy

• Nuclear Energy

• Chemical Energy

• Light Energy

Magnetism

•The attraction or repulsion of
an object due to its magnetic
field.
•Ex. Electromagnet, bar
magnet

Multiple Choice

What is sound energy?

• An example of PE, because energy is stored in sound

• An example of KE, because energy is carried through vibrating waves

• An example of PE, because energy stored in an atom

• An example of KE, because energy travels through electromagnetic waves

Match

Match the types of Energy.

• Gravitational Energy

• Elastic Energy

• Chemical Energy

• Nuclear Energy

Stored in an object above ground.

Stored in an object that can be stretched or compressed.

Stored within bonds of atoms.

Stored within the nucleus of atoms.

• Stored in an object above ground.

• Stored in an object that can be stretched or compressed.

• Stored within bonds of atoms.

• Stored within the nucleus of atoms.

Match

Match the types of Energy.

• Thermal Energy

• Sound Energy

• Electromagnetic Energy

• Electrical Energy

Motion of particles

Motion of vibrating waves

Motion of electromagnetic waves

Motion of electrons through a wire

• Motion of particles

• Motion of vibrating waves

• Motion of electromagnetic waves

• Motion of electrons through a wire