Energy

Forms of Energy

100

Why can we feel speakers when music is being played loudly?

Sound travels in waves and vibrations, which we can feel.

200

Look at the picture of the bookshelf. Which book has the most potential energy? How do you know?

B) They all have the same mass, but this one is the highest.

300

What form of energy is NOT present in the classroom?

Nuclear energy

400

What form of energy is found in both a battery and an apple?

Chemical energy

500

List all of the forms of energy you see in this picture and where you see them.

Chemical- Fuel, gas grill...

Thermal and Radiant- Sun

Thermal- Gas grill

Kinetic- cars

Potential- baseball

Energy Transformations

100

Finish the definition: The Law of Conservation of Energy States that energy cannot be 

created or destroyed. It can only transform from one form of energy to another.

200

This person is using a bicycle to power his computer. Which option best shows the energy transformations taking place? Look at the multiple choice options on your worksheet.

C. mechanical --> electrical --> light + sound

300

As a car drives up hill, some kinetic energy is transformed into potential energy. What happens to the total amount of energy and how do you know?

The total amount of energy stays the same because energy cannot be created or destroyed. It can only be transformed.

400

Write the energy transformations that occur as the people bike downhill. Daily Double!

potential + chemical -> kinetic + thermal

500

California has stopped selling the old incandescent light bulbs, and now only sells new LED bulbs. Why do you think they did that? Think about the forms of energy that are produced when energy is transformed in a lamp.

The new bulbs save energy and money because less of their energy is transformed into heat. We don't need heat with our light, so when some of it comes off as heat, it's a waste of energy.

Heat Transfer

100

Which method of heat transfer only occurs in gases and liquids?

Convection

200

Which type of heat transfer most often occurs when two solid objects touch?

Conduction

300

How can you tell that the heat we feel from a lightbulb is being transferred through radiation and not convection?

We can feel the heat from all directions, showing the heat is traveling in waves. In convection, the hot air rises up. 

400

Explain why the blobs of wax rise and fall in a lava lamp. (Hint: What happens to the particles in convection?)

The wax on the bottom is heated up by the hot bulb. The particles start moving faster and farther apart, making the hot wax rise. When the wax cools at the top of the lamp, it becomes denser and sinks to the bottom.

500

A chair with metal arms has been sitting in the sun for a few hours. Michael sits in the chair, and then jumps up in pain. Explain what happened using at least two pieces of thermal energy vocabulary.

Radiation caused the heat from the sun to warm up the chair. When Michael sat down, the thermal energy transferred to him through conduction. That's why he was burned and jumped in pain.

Thermal Energy

100

Objects get bigger when they are heated up because their particles move faster and farther apart. What is this called?

Thermal expansion.

200

What temperature is shown on the thermometer?

-4 degrees

300

What is the difference between an insulator and a conductor?

An insulator does not allow heat to flow easily, whereas a conductor does allow heat to flow easily.

400

In two classes, the metal cup lost more heat than any other material. Why did this happen? Restate and answer the question. Then use text evidence (from your notes or background info) to support your answer. (RACE)

The metal cup probably lost the most heat because metal is a good conductor. According to the background information, "thick or dense materials tend to allow heat to pass through them easily because thermal energy can move quickly from one particle to the next." Metal is a dense material, so this shows that the metal cups allowed heat to pass through them easily.

500

Why do our hands feel cold when we touch something cold, like the window? Use information about heat transfer to explain your answer. 

Our hands feel cold because thermal energy always moves from warmer objects to colder objects when those objects touch. So when we touch the window, thermal energy moves out of our hands and into the window. 

Random

100

What is the definition of energy?

The ability to cause change.

200

What direction does thermal energy move when two objects touch?

From the warmer object to the colder object.

300

Use evidence to explain the trend in your graph. (603 use the graph from the brain starter.)

The trend in my graph shows that as the time increases (or goes by), the temperature of the water also increases. For example, at minute 1, the temperature was 2 degrees. At minute 5, the temperature was 28 degrees. Lastly, at minute 9, the temperature was 70 degrees.

400

Imagine you go to get a frozen coffee frappe (cold drink) from McDonalds. The drink is so cold it hurts your hands! What do you do to solve the problem, and why? Use your knowledge of thermal energy to answer the question.

Put ________ around the cup as an insulator. Or put gloves on as an insulator to stop heat from leaving your hands and going into the cup.

500

A roller coaster car is driven to the top of the first hill. Which roller coaster will have enough kinetic energy to carry it over the second hill? How do you know?

The roller coaster where the second hill is smaller than the first. This is true because kinetic energy will never been greater than the potential energy it started with. The ones with bigger hills requires more energy than what they started with.