EOC Review Semester 1 2015

Describe an example that would fit this energy change chart.

Which is the best example of the energy diagram?

The correct answer is C.

Describe a situation where this graph would represent what is happening.

This graph would fit the hot tea/cold tea problem

Describe what is happening with temperature for each line.

One line starts at 40 degrees and decreases to below room temperature. The other line starts at 5 degrees and increases past room temperature.

Describe a situation where this graph would represent what is happening.

The top line could represent the temperature of hot water after ice is added. The bottom line could represent the temperature of ice added to hot water.

What does a horizontal temperature line mean?

A horizontal line represents constant temperature.

The correct answer is A.

Describe what would happen if the “balls” were dropped and why that would happen.

The last two balls on the right would move to the right because the momentum is transferred.

Which picture depicts what would happen if they were dropped?

The correct answer is B.

In which direction will the suitcase lying in the frictionless truck bed move if the truck is moving north and stops? Why?

The suitcase continues moving north because of Newton’s 1st Law (an object in motion stays in motion).

What would happen if the truck takes off suddenly and the package is on a frictionless truck bed with no tailgate? Explain

The truck will forward but the suitcase will stay put and fall to the ground because of Newton’s 1st Law (an object at rest, stays at rest).

What are 2 questions that Linda could test and which trials would she use for each question?

How does the size of the ramp affect the distance the ball travels? Use trials 2, 4, and 5 How does the size of the ball affect the distance it travels? Use trials 1, 3, and 5

Which question best fits the ramp question? Do balls of different metals roll down the ramp faster? Would increasing the friction on the ramp decrease the speed? Would increasing the length of the ramp change the speed of the ball? Does the size of the steel ball affect the time it takes to reach the bottom of the ramp?  

What is a question that could be answered by this experiment?

Choose from the following the question that is being studied in this experiment? What is the melting point of the wax? What is the melting point of each metal? Which metal radiates heat the best? Which metal conducts heat the best?

The answer is “Which metal conducts heat the best?”

Pablo wondered if different colored sand heats up differently in light Pablo wondered if different colored sand heats up differently in light.  He set up two beakers, one containing 50 grams (g) of light-colored sand and the other with 50 g of dark-colored sand.  He placed the beakers side by side under a lamp.  He measured the temperature of the sand in each beaker every two minutes and recorded his results in the table. What can you deduce from his experiment? Which variable did Pablo forget to control during his investigation?

The data shows that the dark sand temperature increased more He did not control for the starting temperature

Mr. Jones set up a demonstration for his science class using two beakers.  Each beaker contained 50 ml of a clear liquid.  The temperature of each liquid was 25°C.  Mr. Jones placed a cube into each beaker at the same time.  Each cube measured 2 cm on all sides and had a mass of 5 grams.  

How long did it take for the cube in Beaker 2 to sink? What is the best question for students to investigate that would help explain the results of this demonstration? How long did it take for the cube in Beaker 2 to sink? Would a different sized beaker provide the same results? Will the cube in Beaker 1 sink if more liquid was added? What caused one cube to float and the other cube to sink?

The correct answer is “What caused one cube to float and the other cube to sink”.