GROUP 1Introduction

Group 1 question

SIMULATION LINK:BUOYANCY

The followingtutorial videowill offer tips and guidance in completing this activity and using the simulation:

The first step in the scientific method is toASK A QUESTION. The questions we will attempt to answer in this activity are as follows:

1. How does the density of a material affect whether it sinks or floats?
2. How does the weight of the object compared to the buoyant force affect whether it sinks or floats?
3. How does the weight of the displaced fluid relate to the buoyant force?

Before trying to answer these questions, we must outline what we know about buoyancy and the related principles in order to form our hypothesis.CONDUCT RESEARCHin your course notes to answer the following questions:

QUESTION 1.1

Archimedes' Principle states:

Choose one 2 points

The weight of the fluid displaced isalwaysless than the buoyant force.

The weight of the fluid displaced isalwaysequal to the buoyant force.

The weight of the fluid displaced isalwaysgreater than the buoyant force.

GROUP 2Hypothesis

Group 2 questions

The following two questions are predictions and points will not be deducted if they are incorrect. We will test our hypothesis based on results from the lab experiment for credit in future questions.

QUESTION 2.1

HYPOTHESIS #1 -If an object has a density greater than the liquid in which it is placed, I predict that it will:

Choose one 0 points

Sink

Float

Neither sink nor float.

QUESTION 2.2

HYPOTHESIS#2 -If the buoyant force is greater than the weight of the object, I predict that it will:

Choose one 0 points

Sink

Float

Neither sink nor float.

GROUP 3Virtual Lab - First Drop

Group 2 questions

Open theBuoyancy Virtual Lab

The simulation should open with a cube suspended above a rectangular tank containing multiple fluids.

In the top right-hand control panel, change the "Simulation" type to "Experiment".

This should change the tank's contents to only water.

In the top right-hand control panel, change the "Test Object" type to "Wood."

The buoyant force will be displayed on top of the test object, as a blue vector pointed upward. Its numerical value will be displayed immediately below. You will need to watch the behavior of this vector as the test object is dropped into the water below.

Click "Play" to drop the wood test object into the water.

Wait for the test object to stop bobbing up and down.

QUESTION 3.1

Note that the test object initially sank into the water before bobbing back up. As the test object sank deeper into the water, what happened to the buoyant force?

Choose one 5 points

It increased.

It decreased.

It did not change.

QUESTION 3.2

With the test object at rest in the water, how does the buoyant force compare to the gravity force (represented by the yellow vector pointing downward from the bottom of the test object)?

Choose one 5 points

Gravity is stronger.

Buoyant force is stronger.

The two forces are equal in strength.

GROUP 4Virtual Lab - Second Drop

Group 4 questions

In the top right-hand control panel, click "Reset" to prepare for the next experiment.

Take note of the initial water-level / water-volume measurement. This value is displayed to right of the water's surface.

Click "Play" to again drop the wood test object into the water.

Wait for the test object to stop bobbing up and down.

Take note of the new water-level / water-volume measurement.

QUESTION 4.1

How much water is displaced by the floating test object?

Choose one 5 points

No water is displaced.

0.5 L

1.0 L

1.5 L

2.0 L

2.5 L

3.0 L

QUESTION 4.2

What is the weight (w) of 1 L of water?

The weight (on Earth) is found by multiplying the mass of the water by the acceleration of gravity on Earth.=

The mass (m) of 1 L of water is 1 kg.1=1

The acceleration of gravity on Earth (g) is 9.8^m_s². (g= 9.8^m_s²)

Choose one 5 points

1 N

0.01 N

9.8 N

98 N

QUESTION 4.3

What is the weight (w) of the water displaced by the test object?

(Hint: Use information found in questions 4.1 and 4.2)

Choose one 5 points

4.9 N

9.8 N

49 N

98 N

QUESTION 4.4

How does the weight of the water compare to the buoyant force?

(Remember that buoyant force is represented in the simulation by the blue vector point up from the top of the test object.)

Choose one 5 points

Buoyant force is greater.

Weight of displaced water is greater.

They are the same.

They are equal in magnitude, but opposite in direction.

GROUP 5Virtual Lab - Third Drop

Group 3 questions

In the top right-hand control panel, click "Reset" to prepare for the next experiment.

Also change the "Test Object" type to "Aluminum."

Note the initial volume of the water.

Press "Play" to drop the aluminum test object into the water.

Note the new volume of the water.

QUESTION 5.1

How much water does the aluminum test object displace?

Choose one 5 points

No water is displaced.

0.5 L

1.0 L

1.5 L

2.0 L

2.5 L

3.0 L

QUESTION 5.2

What is the weight (w) of the water displaced by the aluminum test object?

(Hint: Same method as 4.2 &4.3)

Choose one 5 points

4.9 N

9.8 N

49 N

98 N

QUESTION 5.3

How does the weight of the displaced water compare to the buoyant force?

Choose one 5 points

Buoyant force is greater.

Weight of displaced water is greater.

They are the same.

They are equal in magnitude, but opposite in direction.

GROUP 6Virtual Lab - Mystery

Group 4 questions

Without resetting the experiment, change the fluid type.

In the top left-hand control panel, click the box next to "Mystery."

Note the volume measurement for the mystery fluid.

QUESTION 6.1

How much mystery fluid does the test object displace?

Choose one 5 points

No mystery fluid is displaced.

0.5 L

1.0 L

1.5 L

2.0 L

2.5 L

3.0 L

QUESTION 6.2

Based on what you have learned about buoyant forces and the weight of displaced liquids, what is the weight of the displaced mystery fluid?

(Hint: Look at questions 4.4 and 5.3)

Choose one 6 points

4.9 N

9.8 N

14.2 N

49 N

98 N

142 N

QUESTION 6.3

What is the mass of the displaced mystery fluid?

(Hint: Weight is mass times the acceleration due to gravity.)

Choose one 6 points

0.5 kg

0.8 kg

1.0 kg

1.4 kg

QUESTION 6.4

Calculate the mystery fluid's density by dividing the mass of displaced mystery fluid by the volume of displaced mystery fluid.

Choose one 6 points

0.5 kg/L

0.8 kg/L

1.0 kg/L

1.4 kg/L

2.0 kg/L

GROUP 7Virtual Lab - Custom Cube

Group 5 questions

On the top right-hand control panel, click "Reset" to prepare for the next experiment.

On the top left-hand control panel, change the fluid type back to "Water".

On the top right-hand control panel, change the "Test Object" type to "Custom Cube."

On the bottom right-hand control panel there are three sliders that control the test object's mass, density, and volume. There are also tick boxes to the left of each slider that lock the value of that property.

Click the box to lock the "Volume" slider.

Move the "Mass" slider back and forth. Observe the changes to the "Density" slider.

QUESTION 7.1

What is the relationship between the mass of the Custom Cube and the density of the Custom Cube?

Choose one 6 points

They are directly proportional.

They are inversely proportional.

They are exponentially proportional.

They have no relationship.

QUESTION 7.2

Click to unlock the "Volume" slider and click to lock the "Mass" slider.

Choose one 6 points

Move the "Volume" slider back and forth. Observe the changes to the "Density" slider.

What is the relationship between the volume of the Custom Cube and the density of the Custom Cube?

They are directly proportional.

They are inversely proportional.

They are exponentially proportional.

They have no relationship.

QUESTION 7.3

Click to unlock the "Mass" slider.

Click "Play" to drop the custom cube into the water.

If the custom cube does not come to rest at the surface of the water, adjust its property sliders until it does.

Which density is greater, the (current) density of the Custom Cube or the density of the water?

Choose one 6 points

The density of the Custom Cube.

The density of the water.

The densities are the same.

QUESTION 7.4

Adjust the custom cube's property sliders until the cube sinks to the bottom of the tank.

Which density is greater, the (current) density of the Custom Cube or the density of the water?

Choose one 6 points

The density of the Custom Cube.

The density of the water.

The densities are the same.

QUESTION 7.5

Adjust the Cube's property sliders until the Cube floats stationary in the middle of the water.

Which density is greater, the (current) density of the Custom Cube or the density of the water?

Choose one 6 points

The density of the Custom Cube.

The density of the water.

The densities are the same.