Heat Sources
Heat in Motion
Sharing the Warmth
Where Can Heat Come From?
100
Chet is camping. Which of his camping items can produce heat?
A. backpack
B. flashlight
C. sunglasses
D. toothbrush
B. flashlight
100
Jamal is toasting marshmallows on a stick over a campfire. In what direction does heat flow to toast his marshmallows?
A. from the air to the fire
B. from the fire to the marshmallows
C. from the marshmallows to the logs
D. from the stick to the marshmallows
B. from the fire to the marshmallows
100
Yori’s energy bar has a hard yogurt coating. She doesn’t think that the coating will melt because the day is cold. After eating half the bar, she sees that the coating is melting. In what direction does heat move to melt the bar?
A. from the bar to the air
B. from the air to her hand
C. from her hand to the bar
D. from the bar to her hand
C. from her hand to the bar
100
At a party, there are ice cream, balloons, and a cake with lit candles. Which most likely has the highest temperature?
A. balloon B. candle
C. bowl D. ice cream
B. candle
200
Kendall is grocery shopping with her dad. She gets a bag of frozen broccoli and places it in the grocery cart. Her hands are now very cold, and her dad tells her to rub her hands together. What is the reasoning that explains his claim?
A. Her hands will create electrical energy.
B. Her hands will trap heat from the air in the store.
C. Her hands will create friction, which will create heat.
D. Her hands will reduce the friction she had created with the bag.
C. Her hands will create friction, which will create heat.
200
Judy puts a slice of hot pizza on her plate. When she picks up the plate, it feels warm. In which direction does heat flow to make the plate feel warm?
A. from the pizza to the plate
B. from her hand to the plate
C. from the plate to the pizza
D. from her hand to the pizza
A. from the pizza to the plate
200
Helen takes some bread out of the oven. What reasoning tells why she uses oven mitts?
A. Her hands will look better.
B. Her hands are cold.
C. She wants to keep clean.
D. She wants to protect her hands from the heat.
D. She wants to protect her hands from the heat.
200
On a cold day, Avery makes hot cocoa. She pours the cocoa into a cup and adds small marshmallows. In which direction does heat mostly flow?
A. from the air to the cup
B. from the cocoa to the air
C. from the air to the marshmallows
D. from the marshmallows to the cocoa
B. from the cocoa to the air
300
Khalil’s family is cooking lunch on an outdoor grill. Which things are giving off heat?
A. the coals and the air
B. the food and the flames
C. the grill and the food
D. the coals and the flames
D. the coals and the flames
300
Juan has a beaker filled with ice and water. How will heat move to melt the ice?
A. from the ice into the water
B. from the water into the ice
C. from the water into the air
D. from the beaker into the air
B. from the water into the ice
300
Mali sets a bowl of hot soup on a table. Which statement best describes what happens when she puts the spoon in the soup?
A. The air’s temperature will decrease.
B. The soup’s temperature will increase.
C. The bowl’s temperature will increase.
D. The spoon’s temperature will increase.
D. The spoon’s temperature will increase.
300
How do gloves protect people’s hands from friction?
A. They prevent blisters.
B. They keep hands clean.
C. They keep germs off.
D. They prevent scratches.
A. They prevent blisters.
400
Which action creates the most friction and heat?
A. gently brushing face paint onto your cheeks
B. rubbing your bare hands together numerous times
C. rubbing your soapy hands together underwater
D. smoothing hand lotion onto the palms of your hands
B. rubbing your bare hands together numerous times
400
A mover pushes a box up a ramp.
Which produces the most heat?
A. box moving against the ramp
B. ramp sitting against the truck
C. wind pushing against the box
D. mover’s hands on the box
A. box moving against the ramp
400
Julie has a glass filled with ice and water. How could she make the ice melt more quickly?
A. add more ice
B. put a book under the glass
C. put the glass under a lamp
D. put the glass in a closet
C. put the glass under a lamp
400
Liang turns on her desk lamp and gets a cup of water. She sits at her desk to do homework. Which direction does heat flow to make Liang’s book feel warm after a few minutes?
A. from the book to the cup
B. from the desk to the book
C. from the lamp to the book
D. from the book to the lamp
C. from the lamp to the book
500
Jason is watching a film about rescuers holding on to a rope and climbing down it. One person slides down the last 2 m of the rope. Where does the most heat occur through rubbing?
A. feet and air
B. feet and ground
C. air and rope
D. hands and rope
D. hands and rope
500
At a party, there are ice cream, balloons, and a cake with candles. Which direction has the greatest heat movement?
A. air to ice cream
B. cake to candles
C. balloon to air
D. ice cream to air
A. air to ice cream
500
Mitch read that rubbing skin on skin creates more friction than rubbing skin on paper. How could he best test this?
A. He could rub his hands on a doorknob, then on paper.
B. He could rub his hands together, then on a piece of paper on a table.
C. He could put paper between his hands and rub them.
D. He could rub his hands together inside the building, then outside.
B. He could rub his hands together, then on a piece of paper on a table.
500
Playground slides and water slides can be different sizes and shapes. Look at the picture.
The following statements describe how friction affects the speed of someone coming down the slides. Which statement is correct?
A. The water on slide D decreases friction, making this slide the fastest.
B. The bumps on slide A do not slow the slider down, so this slide is the slowest.
C. Slides C and D have the same speed because wet people create the same friction.
D. Slide B is the slowest slide because it is dry and has more friction than slides C and D.
A. The water on slide D decreases friction, making this slide the fastest.