AKS 7 Review

Energy Transformations

Answer each question and fill in your notes in schoology.

Yesterday you learned "2 Types and 4 Forms of Energy"

• Types: Potential Energy and Kinetic Energy

• Forms of Energy: Thermal, Electrical, Mechanical, and Radiant

• Extra Forms of Energy You Saw: Sound, Chemical, Nuclear, Elastic Potential Energy and Gravitational Potential.

You also learned the "Law of Conservation of Energy"

***Energy cannot be destroyed, but it can be transformed.***

Today we will look at how energy can change from one form to another.

Energy changing from one form to another...

is sometimes called energy conversion or energy transformation.

>>> Any form of energy can change into any other form of energy.

Multiple Choice

See the picture. There is electrical energy coming from the outlet in the wall. When the energy goes into the lamp what energy does it transform into?

• Mechanical Energy

• Thermal Energy

• Sound Energy

• Light Energy

Often one form of energy can change into more than one form.

Chemical-> Heat-> Kinetic-> Electrical-> Heat

Multiple Select

When wood burn it changes from chemical energy to what 2 other forms of energy? Click the 2 other forms.

• Radiant (Light)

• Nuclear

• Heat

• Mechanical

Multiple Select

A gasoline-powered generator is used to provide lighting for a house.

Choose the best 3 energy forms found in this transformation example?

• Chemical

• Mechanical

• Light

• Nuclear

Multiple Choice

Skateboarder #1 is showing potential energy as he waits at the top of the half pipe.

Skateboarder #2 has dropped into the half pipe, to what type of energy has he converted his potential energy?

• Potential

• Thermal

• Kinetic

• Chemical

Food is chemical energy used to make the body function.

• It is converted into kinetic energy to help the body move

• It is also converted into thermal energy to keep the body warm.

Energy Conversion in Plants

• Chemical energy stored in the food we eat ultimately comes from the sun.

• The process is called photosynthesis. Light energy is converted into chemical energy.

Energy Conversions are needed in EVERYTHING we do.

(Think of what you do everyday.)

Some examples of energy conversions

Open Ended

What are the energy conversion for a hair dryer?

Open Ended

What are the energy conversions for a radio?

REMEMBER: Any form of energy can change into any other form of energy.

***Energy cannot be destroyed, but it can be transformed.***

Multiple Choice

A car accelerates along a road as it rises uphill.

Which energy changes are taking place?

• kinetic energy - decreasing

  gravitational potential energy - decreasing

• kinetic energy - decreasing

  gravitational potential energy - increasing

• kinetic energy - increasing

  gravitational potential energy - decreasing

• kinetic energy - increasing

  gravitational potential energy - increasing

Heat

Multiple Choice

In a car engine, energy stored in the fuel is converted into thermal energy (heat energy) and energy of motion (kinetic energy).

In which form is the energy stored in the fuel?

• chemical

• geothermal

• hydroelectric

• nuclear

Multiple Choice

Heat makes things _______________________

• colder
• warmer
• faster

Multiple Choice

What is the source of the energy converted by a hydro-electric power station?

• hot rocks

• falling water

• oil

• waves

Multiple Choice

A tidal power station is made by building a barrage across the mouth of a river. At high tide the sea water is trapped

At low tide the water is allowed to flow back into the sea through a turbine. What is the useful energy change in a tidal power station?

• electrical energy → energy of position (potential)

• electrical energy → energy of motion (kinetic)

• energy of motion (kinetic) → energy of position (potential)

• energy of position (potential) → electrical energy

Multiple Choice

The diagram shows a man diving into water.

Which form of energy is increasing as he falls?

• chemical

• gravitational

• kinetic

• strain

Multiple Choice

Heat is a form of _______________.  

• movement
• energy
• melting

Multiple Choice

A child pushes a toy car along a level floor and then lets it go. As the car slows down, what is the main energy change?

• from chemical to heat

• from chemical to kinetic

• from kinetic to gravitational (potential)

• from kinetic to heat

Multiple Choice

Without the sun's heat, what would happen to earth?

• aliens would invade

• the earth would explode

• it would be too cold to survive

Multiple Choice

The diagram shows a cyclist riding along a hilly road.

At which position does the cyclist have the least gravitational (potential) energy?

• A

• B

• C

• D

Multiple Choice

What is designed to change electrical energy into kinetic energy?

• generator

• motor

• transformer

• electric fan

Multiple Choice

A power station uses nuclear fission to obtain energy.

In this process, nuclear energy is first changed into

• chemical energy.

• electrical energy.

• gravitational energy.

• thermal energy.

Multiple Choice

A man standing at the top of a cliff throws a stone.

Which forms of energy does the stone have at X and at Y?

• energy at X - gravitational potential only

  energy at Y - kinetic only

• energy at X - kinetic only

  energy at Y - gravitational potential only

• energy at X - gravitational potential only

  energy at Y - gravitational potential and kinetic

• energy at X - gravitational potential and kinetic

  energy at Y - gravitational potential and kinetic

Multiple Choice

What is a conductor?

• a material that heat moves through easily

• a material that heat does not move through easily

• a material that turns cold when heated

• a tool for measuring temperature

Multiple Choice

Which of these is a better conductor?

Multiple Choice

Stir frying vegetables is an example of

• Convection

• Conduction

• Radiation

Multiple Choice

Hot water rises and cold water sinks. Is this:

• Convection

• Conduction

• Radiation

Multiple Choice

The sun shines down on this family as the play on the beach.

• conduction
• convection
• radiation

Multiple Choice

Cold Pack on Person

• Heat is transferred from the cold pack to the person.

• Heat is transferred from the person to the cold pack

• The cold pack is getting colder. The person is getting warmer.

Specific Heat Capacity Part II

Communicate to explain the applications of specific heat capacity in daily life, material engineering and natural phenomena.

Multiple Choice

There are four cups of hot cocoa. The cup sizes are shown. The temperature of the cocoa in each cup is 25 degrees celsius. Which cup has the MOST thermal energy?

• Large cup (Trenta)

• Small cup (Tall)

• Medium cup (Venti)

• All three are the same temperature so they have the same thermal energy

Multiple Choice

Copper, Stainless Steel, Carbon Steel, and Zinc were all heated using 10,000 JOULES of thermal energy.  What material would be have the LARGEST change in temperature?

• Copper

• Carbon Steel

• Zinc

• Stainless Steel

Multiple Choice

A high specific heat means...

• It requires less energy to change temperature

• It requires more energy to change temperature

• It heats up very quickly

Multiple Choice

Copper, Stainless Steel, Carbon Steel, and Zinc were all heated using 10,000 JOULES of thermal energy.  Based on the chart, which material would be have the SMALLEST change in temperature?

• Copper

• Carbon Steel

• Zinc

• Stainless Steel