# Teacher Investigations

A partial listing of the teacher investigations is contained here.

 How quickly can you melt an ice cube? Can you predict the temperature? Systems and Energy of Position and Motion

## Investigation H1: Melting Ice

### Activity H1.2: How quickly can you melt an ice cube?

(Design Activity)

Your group's task will be to melt an ice cube as fast as possible.

1. WHAT'S YOUR IDEA? Describe the approach you will use.

2. WHAT ARE THE GROUP'S IDEAS? Discuss the approaches that other members of your group plan to use.

After the signal from the instructor, carry out your plan. Raise your hand when your cube has completely melted.

3. MAKING SENSE: What techniques were most successful? Why? Discuss this with your group.

What is heat?

What is temperature?

Compare your definitions with others in your group. What are the similarities and differences between definitions?

## Model Development

### Activity H3.1: Can you predict the temperature?

(Laboratory Activity)

1. WHAT'S YOUR IDEA? Predict in advance of carrying out the experiment, the final temperatures of the following mixes of water. The mixes of water that could be used are:

a) equal amounts at equal temperatures
b) equal amounts at unequal temperatures
c) unequal amounts at equal temperatures
d) unequal amounts at unequal temperatures.

2. WHAT ARE THE GROUP'S IDEAS? Compare your prediction with others in your group.

Now that you have predicted the final temperatures, you should determine the actual values from carrying out the experiment.

3. MAKING SENSE: Develop a rule to enable you to predict the final temperature of mixtures of various amounts of water at various temperatures.

Rule:

What evidence can you offer that your rule works?

What rules did other groups come up with?

4. WHAT'S YOUR IDEA? From your mixing observations, can you tell which parts of your mixtures gained or lost heat energy?
Can you tell if the cooler water gained warmth, or the warm water gained cold?

## Investigation H5: Other Forms of Energy

### Activity H5.3: Systems and Energy of Position and Motion

(Seat Activity)

1. WHAT'S YOUR IDEA? Investigate each of the following systems testing the hypothesis. Write your observations, conclusions, and reasons for each system. Discuss your conclusions and reasoning with your classmates.
Pairs of magnets:

Lifting a pencil:

Simple pendulum:

Mechanical toy:

Inflating a balloon:

Popping a cork:

Electric motor:

Flashlight:

Sound: