# Lesson 4: Heat and the Sun

## Getting Started

In this lesson you will explore heat as a form of energy and will examine the role the Sun plays as a light and heat source. You will also learn the laws that govern energy.

### Stuff You Need

• Let's Explore Energy by Moving Beyond the Page
• 3 glasses or cups
• alligator clips (kit)
• battery (kit)
• buzzer (kit)
• cardboard (kit)
• color wheel (kit)
• dark colored clothing
• dowel rods (kit)
• gears (kit)
• hot glue gun or strong fast tack craft glue
• lids (kit)
• light colored clothing
• magnifying glass (kit)
• markers
• motor (kit)
• solar panel (kit)
• straws (kit)
• tape
• white paper

• What is the unique relationship between the Sun and living things?
• What is the Sun's relationship to different types of energy?
• How does energy change?

### Things to Know

• Thermodynamics is a branch of science that focuses on heat and how it is related to work, energy, temperature, and matter.
• The first law of thermodynamics states that energy cannot be created or destroyed, but it can be changed.
• The second law of thermodynamics states that energy always moves from hot things to cold things.
• The third law of thermodynamics states that nothing can be colder than absolute zero (-276.16 degrees C / - 459.67 degrees F).
• The Sun's energy can be used to do work and to heat our homes.

### Skills

• Recognize that energy comes from the Sun to the Earth in the form of light. (S)
• Identify sources of stored energy, such as food, fuel, and batteries. (S)
• Understand that heat is transferred from hot things to cool things. (S)
• Identify and explain the laws of thermodynamics. (S)

### Introducing the Lesson

Explain to your child that in this lesson she will explore the Sun's role as a source of energy. The activities for Day 2 require a sunny day. If you don't have the proper weather conditions, move on to the next lesson and complete this lesson on your next sunny day.