Sources of Heat: Sun, Fire, and Friction
Learning how heat comes from sunlight, flames, and rubbing
Sources of Heat: Sun, Fire, and Friction
Learning how heat comes from sunlight, flames, and rubbing
Science - Grade 2-3
- 1
Name three sources of heat you learned about in this worksheet topic.
One source is in the sky, one has flames, and one happens when things rub together.
Three sources of heat are the Sun, fire, and friction. - 2
The Sun shines on a sidewalk all afternoon. What will probably happen to the sidewalk?
The sidewalk will probably get warmer because sunlight gives it heat. - 3
A campfire is used to roast marshmallows. Is the campfire a source of heat? Explain your answer.
Think about what you feel when you stand safely near a fire.
Yes, the campfire is a source of heat because the flames give off heat that can warm and cook food. - 4
Rub your hands together quickly for a few seconds. What do you feel, and what causes it?
My hands feel warmer because rubbing them together creates friction, and friction can make heat. - 5
Circle the item that is most likely to be warmed by the Sun: an ice cube outside on a sunny day, a book inside a closed drawer, or a pencil in a backpack.
Look for the object that is outside in sunlight.
The ice cube outside on a sunny day is most likely to be warmed by the Sun because sunlight can shine on it directly. - 6
Why should children never play with matches or lighters?
Fire gives off heat, but it can be dangerous.
Children should never play with matches or lighters because they can start fires, and fire can burn people and damage things. - 7
A student slides down a plastic slide. The slide and the student's clothes rub together. What source of heat is being made?
Friction is being made because the student's clothes and the slide rub together, which can create a little heat. - 8
Which source of heat helps warm Earth during the day?
This heat source is a star.
The Sun helps warm Earth during the day by sending light and heat to Earth. - 9
Sort each example into Sun, fire, or friction: a candle flame, warm sand at the beach, and warming hands by rubbing them.
A candle flame is fire. Warm sand at the beach is heated by the Sun. Warming hands by rubbing them is caused by friction. - 10
A pan is on a stove flame. Why does the pan get hot?
A flame is a heat source.
The pan gets hot because the fire or flame from the stove gives heat to the pan. - 11
True or false: Friction can happen when two surfaces rub against each other. Explain your answer.
True. Friction can happen when two surfaces rub against each other, and it can make heat. - 12
A black T-shirt and a white T-shirt are left in the Sun. Both can get warm. What is the source of the heat?
The color may change how warm they feel, but the heat still comes from the same place.
The source of the heat is the Sun because sunlight shines on the T-shirts and warms them. - 13
Look at these activities: riding a bike and braking, sitting in shade, and lighting a fireplace. Which two activities involve heat being made by friction or fire?
Riding a bike and braking involves friction, and lighting a fireplace involves fire. Sitting in shade is not a heat source. - 14
Why does ice melt faster in sunlight than in a dark freezer?
Melting happens when something gets enough heat.
Ice melts faster in sunlight because the Sun gives heat to the ice. A dark freezer stays cold and does not add enough heat to melt the ice quickly. - 15
Write one safe way people use heat from the Sun, one safe way people use heat from fire, and one example of heat from friction.
Choose everyday examples that do not involve unsafe behavior.
People can use heat from the Sun to dry wet clothes. People can use heat from fire to cook food safely with an adult. Heat from friction can happen when hands are rubbed together.