Feel the heat

Nolan picks up a book from his desk and hands it to his teacher. His teacher sets the book down and slides it across a table. Which action produces the most heat?

• A. sliding the book across a table

• B. handing the book to his teacher

• C. setting the book down on a table

• D. picking the book up from his desk

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-5

When your hands feel cold, it can help to rub them together very quickly. This can make your hands feel warm. Why does rubbing your hands together make them warm?

• A. Rubbing your hands together can cause a fire that produces heat.

• B. Moving your body can cause your heart rate to speed up and warms the blood.

• C. Rubbing your hands together causes friction which can produce heat.

• D. Rubbing your hands together causes energy which produces heat.

Tags

NGSS.MS-PS3-5

A light bulb in the table lamp goes out. Carrie quickly replaces it and burns her fingers when removing the light bulb. Why does this happen?

• A. A light bulb reflects light, which causes her fingers to burn.

• B. A light bulb absorbs heat from the air.

• C. A light bulb produces light and also gives off heat.

• D. A light bulb still has electricity running through it which causes heat.

Several students in a class measured the temperature in different places around the school at 10:00 a.m. The results are shown in the table. What variable below BEST explains why the temperatures are different?

• A. Some of the thermometers did not work well.

• B. Temperature is difficult for students to measure.

• C. Some of the thermometers were placed in shaded areas and some in sunny areas.

• D. Temperature is often different if the thermometer is moved just a few feet away.

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 rub two pieces of paper together.

• D. He could rub his hands together inside his classroom, then outside.

Kayla’s family is cooking lunch on an outdoor grill. Which items are giving off both light and 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