Background: There was no additional air in the tire the second time Lawrence checked the air pressure, but something did change between the two measurements. The tires had rolled over 10 miles of road on the trip to school. Any time one surface moves over another, it causes friction. Friction is a force that opposes the motion of two surfaces that are touching, and friction between two surfaces always generates heat. Quickly rub your hands together and you’ll feel the heat generated by the friction between them. As the tires moved over the road, friction between the tires and road generated heat. In short, the tires got warmer and so did the air inside them.

Situation: Beth was blowing up the kiddie pool for tomorrows party. It was hot outside this afternoon so she was glad when the pool was fully inflated and she could go inside. The next morning when she went outside to put water in the pool she was surprised to see that the pool was no longer fully inflated. She checked but there were no leaks so she added some more air before filling it with water.

Question: Was there less air or the same amount in the pool in the morning?

Situation: Beth was blowing up the kiddie pool for tomorrows party. It was hot outside this afternoon so she was glad when the pool was fully inflated and she could go inside. The next morning when she went outside to put water in the pool she was surprised to see that the pool was no longer fully inflated. She checked but there were no leaks so she added some more air before filling it with water.

Question: Was there more air or the same amount in the pool in the morning?

Situation: Beth was blowing up the kiddie pool for tomorrows party. It was hot outside this afternoon so she was glad when the pool was fully inflated and she could go inside. The next morning when she went outside to put water in the pool she was surprised to see that the pool was no longer fully inflated. She checked but there were no leaks so she added some more air before filling it with water.

Question: Was the air in the pool cooler in the afternoon or morning?

Situation: Beth was blowing up the kiddie pool for tomorrows party. It was hot outside this afternoon so she was glad when the pool was fully inflated and she could go inside. The next morning when she went outside to put water in the pool she was surprised to see that the pool was no longer fully inflated. She checked but there were no leaks so she added some more air before filling it with water.

Question: Was the air in the pool warmer in the afternoon or morning?

Situation: Beth was blowing up the kiddie pool for tomorrows party. It was hot outside this afternoon so she was glad when the pool was fully inflated and she could go inside. The next morning when she went outside to put water in the pool she was surprised to see that the pool was no longer fully inflated. She checked but there were no leaks so she added some more air before filling it with water.

Question: Was the air expanding or contracting over night?

Situation: Beth was blowing up the kiddie pool for tomorrows party. It was hot outside this afternoon so she was glad when the pool was fully inflated and she could go inside. The next morning when she went outside to put water in the pool she was surprised to see that the pool was no longer fully inflated. She checked but there were no leaks so she added some more air before filling it with water.

Question: Did the outside temperature drop or rise overnight?

Situation: Beth was blowing up the kiddie pool for tomorrows party. It was hot outside this afternoon so she was glad when the pool was fully inflated and she could go inside. The next morning when she went outside to put water in the pool she was surprised to see that the pool was no longer fully inflated. She checked but there were no leaks so she added some more air before filling it with water.

Question: Was it hotter outside in the afternoon or morning?

Situation: Beth was blowing up the kiddie pool for tomorrows party. It was hot outside this afternoon so she was glad when the pool was fully inflated and she could go inside. The next morning when she went outside to put water in the pool she was surprised to see that the pool was no longer fully inflated. She checked but there were no leaks so she added some more air before filling it with water.

Question: Was it cooler outside in the afternoon or morning?

Situation: Beth was blowing up the kiddie pool for tomorrows party. It was hot outside this afternoon so she was glad when the pool was fully inflated and she could go inside. The next morning when she went outside to put water in the pool she was surprised to see that the pool was no longer fully inflated. She checked but there were no leaks so she added some more air before filling it with water.

Question: Was the air pressure greater in the afternoon or morning?

Situation: Beth was blowing up the kiddie pool for tomorrows party. It was hot outside this afternoon so she was glad when the pool was fully inflated and she could go inside. The next morning when she went outside to put water in the pool she was surprised to see that the pool was no longer fully inflated. She checked but there were no leaks so she added some more air before filling it with water.

Question: Was the air pressure less in the afternoon or morning?

Situation: Mike noticed his low tire pressure light was on when he left work. After driving for 30 minutes Mike decided to stop and check his tire pressure even though the light had gone off,  it was at 35 psi so he didn't add air. When he started his car the next morning his his low tire pressure light was on.

Question: Did Mike's tire heat up or cool down while he was driving?

Situation: Mike noticed his low tire pressure light was on when he left work. After driving for 30 minutes Mike decided to stop and check his tire pressure even though the light had gone off,  it was at 35 psi so he didn't add air. When he started his car the next morning his his low tire pressure light was on.

Question: Did the air in Mike's tire heat up or cool down while he was driving?

Situation: Mike noticed his low tire pressure light was on when he left work. After driving for 30 minutes Mike decided to stop and check his tire pressure even though the light had gone off,  it was at 35 psi so he didn't add air. When he started his car the next morning his his low tire pressure light was on.

Question: Did the air in Mike's tire heat up or cool down overnight?

Situation: Mike noticed his low tire pressure light was on when he left work. After driving for 30 minutes Mike decided to stop and check his tire pressure even though the light had gone off,  it was at 35 psi so he didn't add air. When he started his car the next morning his his low tire pressure light was on.

Question: Did Mike's tire heat up or cool down overnight?

Situation: Mike noticed his low tire pressure light was on when he left work. After driving for 30 minutes Mike decided to stop and check his tire pressure even though the light had gone off,  it was at 35 psi so he didn't add air. When he started his car the next morning his his low tire pressure light was on.

Question: Was the air pressure in the tire increasing or decreasing as he drove??

Situation: Mike noticed his low tire pressure light was on when he left work. After driving for 30 minutes Mike decided to stop and check his tire pressure even though the light had gone off,  it was at 35 psi so he didn't add air. When he started his car the next morning his his low tire pressure light was on.

Question: Was the air pressure in the tire increasing or decreasing overnight?

Situation: Mike noticed his low tire pressure light was on when he left work. After driving for 30 minutes Mike decided to stop and check his tire pressure even though the light had gone off,  it was at 35 psi so he didn't add air. When he started his car the next morning his his low tire pressure light was on.

Question: Was the movement of air particles in the tire increasing or decreasing as he drove?

Situation: Mike noticed his low tire pressure light was on when he left work. After driving for 30 minutes Mike decided to stop and check his tire pressure even though the light had gone off,  it was at 35 psi so he didn't add air. When he started his car the next morning his his low tire pressure light was on.

Question: Was the movement of air particles in the tire increasing or decreasing overnight?

Situation: Mike noticed his low tire pressure light was on when he left work. After driving for 30 minutes Mike decided to stop and check his tire pressure even though the light had gone off,  it was at 35 psi so he didn't add air. When he started his car the next morning his his low tire pressure light was on.

Question: Was there more or the same amount of air in the tire after driving for 30 minutes?

Situation: Mike noticed his low tire pressure light was on when he left work. After driving for 30 minutes Mike decided to stop and check his tire pressure even though the light had gone off,  it was at 35 psi so he didn't add air. When he started his car the next morning his his low tire pressure light was on.

Question: Was there less or the same amount of air in the tire in the morning?