You have two different rubber balls. These balls are made of the exact same material and have the same temperature. But the balls have different masses as shown in the diagram.

Which ball has the least total thermal energy, Ball A or Ball B?

When the bolts are added to the water, thermal energy will be transferred from the

Which beaker will have the greatest change in temperature?

On the cold day, the smell reached the student with the stopwatch slower than on the warm day. What does this data provide evidence of?

Which bucket of water will have the greatest change in temperature?

Two identical plastic cups contain the same amount of water at two different temperatures, as shown above. Both cups are placed in a room at 50 °C.

At the time the cups were placed in the room, in which cup do the water molecules have lower average kinetic energy?

Two identical plastic cups contain the same amount of water at two different temperatures, as shown above. Both cups are placed in a room at 50 °C.

The temperature of the water in Cup 1 will __________________ over time.

Two identical plastic cups contain the same amount of water at two different temperatures, as shown above. Both cups are placed in a room at 50 °C.

Because the temperature of the water in Cup 1 is ______ than the temperature in the room, thermal energy is transferred from the ______ to the ______.

A hot pan was taken from the oven and placed on a table. The rate of thermal energy transfer between the pan and its surroundings depends on which of the following?

Bowling Pin 1 and Bowling Pin 2 are shown to the right.

They are both made up of the same types of molecules. They are both made up of the same number of molecules.

Bowling Pin 2 has more thermal energy than Bowling Pin 1.

Is the average speed of the molecules of Bowling Pin 1 more, less, or the same as the average speed of the molecules of Bowling Pin 2?

A cook uses a metal bucket to make ice cream. After making ice cream, he places the cold bucket on the warmer counter. After some time, the metal bucket, the counter, and the air in the room will be at the same temperature. Why?

In the morning, a student puts a warm can of soda in a cooler filled with ice.

What happened to the total amount of energy in the cooler containing the can of soda and the ice?

Heat always travels from...

When camping, we want to make soup and hot cocoa, but don’t like to carry all the heavy cooking pots needed to make hot water. Our new Wilderness Survival kit claims we can make hot water without a stove or pot! The kit provides a plastic bag to hold water, and matches to make a fire. The instructions say, “Build a fire. Find rocks. Put rocks in the fire until they get hot. Add hot rocks to the bag of water until the water is hot.” To prepare for our trip, we created a laboratory model of the hot water system. Our goal was to test it out in the lab to see how it could work best in the wilderness. Figure 1 shows the laboratory model, consisting of a plastic bag, partially filled with water, and the added hot rock. 

Initial rock temperature = 200C

Initial water temperature = 20C

In which model, does the arrow represent the flow of thermal energy in the system.

If thermal energy is increasing, what is happening to the kinetic energy.

Energy transferred between two objects with varying temperatures, always transferring from warmest to coldest until the two objects have equal temperatures.

You are asked to conducted an experiment to see if changing the amount (mass) of rock in the system would affect the heating of the water (Figure 2). 

You used two rocks of different masses and heated them both in an oven until they reached 200C. We used equal amounts of 20C water  in each container. 

Figure 2 shows the change in water temperature Before and After a given amount of time. 

Which statement best describes why the change in water temperature is different for Rock A and Rock B in Figure 2.

When camping, we like to have hot cocoa made with milk. We conducted a second experiment to compare using milk in the plastic bag, instead of water. We used two rocks of the same mass at a temperature of 200C, and added the hot rocks to two separate plastic bags, each containing equal amounts of milk or water (Figure 3).

We found that the final temperature of the milk was different from the final temperature of the water, even though all the other experiment conditions were the same.

Use your knowledge of thermal energy transfer which statement describes why the final temperature of the milk was different from the final temperature of the water.