Energy Transformations

Energy Transformations

1. ​Carefully read the next 20 slides

2. Then answer some questions about what you have just read and what we have learned in class the last few weeks

​(Radiant)

• ​Example: Microwave

Multiple Choice

According to the Law of Conservation of Energy, energy cannot be _________ or ____________. 

• destroyed, destroyed
• created, saved
• created, destroyed
• lost, found

Multiple Choice

A man is standing on his snow skis on a ski slope near the top of a mountain.  As he leans forward, gravity pulls on him, causing the man to ski down the slope.  At the bottom of the slop, the man turns sharply to his right and comes to a stop.  Which of the following statements correctly describes the energy associated with the man?

• The potential energy of the man increases as his velocity increases as he skis down the slope.

• All of the kinetic energy of the man is converted to potential energy at the bottom of the slope.

• The man’s kinetic energy is greatest at the top of the slope.

• The man’s potential energy is increasing as the force of gravity is pulling him down the slope.

Multiple Choice

Kinetic energy and potential energy are two different types of energy, but both types give an object the ability to do work.  Which of the following is another similarity between kinetic and potential energy?

• Both kinetic and potential energy can be created or destroyed.

• The magnitude of the kinetic energy and the potential energy of an object does not depend upon the object’s mass.

• Both kinetic and potential energy can cause a change in an object.

• Neither kinetic energy nor potential energy can exist in space.

Multiple Choice

Energy transformations occur even in the most simple tasks.  Which of the following examples best demonstrates how mechanical energy is transformed into heat energy?

• A child leaves his metal toy car outside for several hours.  When he tries to pick it up in the day, he drops the car quickly because it burns his fingers.

• A student drags his socked feet across a carpeted floor.  He touches a metal door knob and see’s a spark shoot across his fingers to the door knob.

• A boy flattens a metal BB pellet with a hammer.  He blows on the warmed pellet before picking it up.

• A school teacher places her frozen meal in a microwave oven and runs the oven on “High” for five minutes to cool the meal.

Multiple Choice

During a thunderstorm, power to Diego’s house is lost.  He finds his flashlight and turns on the switch, but no light is emitted from the flashlight.  He remembers that he forgot to recharge the flashlight’s rechargeable batteries.  Which energy transformation did not occur as a direct result of Diego not recharging the battery?

• electrical energy → light energy

• chemical energy → electrical energy

• chemical energy → light energy

• electrical energy → chemical energy

Multiple Choice

In the classroom demonstration below, a rubber ball is dropped from Position 1. The ball bounces as shown. At which of these positions does the ball have both the greatest kinetic energy and the least potential energy

• one

• two

• three

• four

Multiple Choice

The main parts of a working clothes dryer are shown in the diagram. This appliance dries clothes primarily by converting —

• Electrical energy to heat and mechanical energy

• Mechanical energy to heat and electrical energy

• Electrical energy to heat and light

• Mechanical energy to heat and vaporization

Multiple Choice

A teacher rubbed a match against a piece of sandpaper. The match started to burn. Which statement best describes the energy changes that occurred?

• The chemical energy stored in the match changed to thermal and light energy.

• The thermal energy stored in the match changed to light energy and chemical energy.

• The light energy and thermal energy stored in the match changed to mechanical energy.

• The light energy and thermal energy stored in the match changed to chemical energy.

Multiple Choice

The diagram below shows how coal is a fuel source that uses heat energy to turn mechanical energy into electrical energy. Between which two points is heat energy converted into mechanical energy?

• one and two

• two and three

• three and four

• six and seven

Multiple Choice

Sources of radiant energy include .

• Running, a potato, and gasoline

• A microwave, fire, and water vapor

• People, coal, and a blender

• Stars, the Sun, and a lamp

Multiple Choice

When a lion eats a zebra and then uses the energy from the zebra to run, the lion’s body converts — 

• chemical energy to mechanical energy 
• electrical energy to chemical energy 
• chemical energy to light energy 
• mechanical energy to chemical energy 

Multiple Choice

The diagram below shows a hot air balloon rising. Propane gas tanks are seen at the bottom of the balloon.  What energy transformations occur when propane gas is used to lift the balloon? 

• Mechanical to light to chemical
  
• Chemical to mechanical to thermal 
• Thermal to chemical to light
  
• Chemical to thermal to mechanical 

Multiple Choice

The blades of a toy helicopter spin when its circuit is connected to a battery. Which sequence below correctly identifies the energy changes taking place in the helicopter?

• chemical to electrical to potential

• chemical to electrical to mechanical

Multiple Choice

1. A student investigated the energy transformations that occur when a call is placed from cell phone A and received by cell phone B. The student drew a diagram to show the process. Based on the diagram, what evidence is there for the transformation of chemical energy into electrical energy, and which other energy transformations must occur for the call to be received by cell phone B?

• Evidence:

  Cell phones are powered by a battery that produces the electricity used to send or receive a call.

  Transformation 1: Sound energy is transformed into

  electrical energy by cell phone A.

  Transformation 2: Electrical energy is transformed into mechanical energy in the cell towers and base station

• Evidence:

  Cell phones are powered by a battery that produces the electricity used to send or receive a call.

  Transformation 1: Sound energy is transformed into

  electromagnetic waves by cell phone A.

  Transformation 2: Electromagnetic waves are transformed back into sound energy by cell phone B.

• Evidence:

  Base stations are powered by a battery that produces the electricity used to receive and forward a call.

  Transformation 1: Sound energy is transformed into electrical energy by cell phone A.

  Transformation 2: Electrical energy is transformed into mechanical energy in the cell towers and base station

• Evidence:

  Base stations are powered by a battery that produces the electricity used to receive and forward a call.

  Transformation 1: Sound energy is transformed into electromagnetic waves by cell phone A.

  Transformation 2: Electromagnetic waves are transformed back into sound energy by cell phone B

Multiple Choice

a boy riding a bike has this type of ENERGY

• Gravitational Potential

• chemical

• elastic

• mechanical

Multiple Choice

a ball on the top of a building has this type of ENERGY

• Electrical

• Sound

• Thermal

• Gravitational Potential Energy

Multiple Choice

At point B, the energy is ______.

• Potential

• Kinetic

• Thermal

• Chemical

Multiple Choice

What type of energy is being used by the bowling ball?

• electromagnetic

• mechanical

• thermal

• sound

Multiple Choice

Which 2 letters have the most kinetic energy

• W & Y

• X & Z

Multiple Select

A fire gives off what kind of ENERGY? Choose all that apply

• Light

• Sound

• Thermal

• Chemical

Multiple Choice

gasoline has this type of ENERGY

• chemical

• nuclear

• gravitational potential

• electromagnetic

Multiple Choice

Power lines carry this type of ENERGY

• sound

• mechanical

• electrical

• nuclear

Multiple Choice

A car speaker is an example of this type of ENERGY

• Thermal

• Nuclear

• Elastic

• Sound

Multiple Choice

A microwave has this type of ENERGY

• electromagnetic (radiant)

• sound

• thermal

• elastic

Multiple Choice

What energy conversions take place when you vigorously rub your hands together?

• Mechanical => light

• chemical => thermal

• mechanical => thermal

• kinetic => chemical

Multiple Choice

Which kind of energy change occurs when a candle is burning?

• Chemical to light.
• Light to electrical.
• Solar to heat.
• Chemical to electrical.

Multiple Choice

Which type of energy transformation occurs when a flashlight shines?

• chemical → thermal → electrical
• chemical → electrical → light
• thermal → chemical → light
• chemical → electrical → chemical

Multiple Choice

What type of energy is food energy stored in your muscles?

• mechanical

• nuclear

• thermal

• chemical

Multiple Choice

Which type of energy propels a baseball after it has been struck by a bat?

• chemical

• thermal

• mechanical

• nuclear

Multiple Choice

A television works by transforming electrical energy into what other kinds of energy?

• Light, thermal, and sound
• Thermal, chemical, and solar
• Sound, mechanical, and electrical
• Light, chemical, and mechanical

Multiple Choice

Water high in the air falls due to gravity, the moving water spins turbines, and they create/store electricity...
Pick the BEST Energy Conversion below for a Hydroelectric Dam.

• Mechanical to Electrical
• Electrical to Mechanical to Thermal
• Potential to Kinetic to Electrical
• Kinetic to Mechanical to Electrical

Multiple Choice

Photosynthesis goes through two energy transformations. What are the transformations?

• radiant ➡️ chemical

• chemical ➡️ radiant

• electrical➡️ nuclear

• radiant ➡️ sound

Multiple Choice

Some students observing a classroom device being used, noticed the below energy transformations. 
Electrical → Mechanical → Sound
Which device were the students most likely observing?

• Automatic pencil sharpener

• Refrigerator
• Speaker or Loudspeaker
• Television

Categorize

Options (20)

A Dam

Windmill

Pendulum

Roller Coaster

A Spring

Battery

A Matchstick

Firework

Gasoline

Food

Lightning

Light Bulb

Laser Beam

A candle in a dark room

TV Screen (on)

The Sun

Cell phone signal

X-rays

Radio

Microwave

Organize these options into the right categories

Mechanical Energy

Chemical Energy

Light Energy

Radiant Energy