Find Out About Floating
Experiment/Activity # 2
Carla Shoemaker and Tabbatha Monroe
Feb. 20, 2010
Questions to think about before we get started:
Why do you think some things will float and some things do not? Does it have anything to do with what the item you are trying to float is made of? What does buoyancy? Does floating or sinking have anything to do with gravity?
Science Standards:
GLE 0407. Inq. 1 Explore different scientific phenomena by asking questions, making logical predictions, planning investigations, and recording data.
GLE 0407.9.1 Collect data to illustrate that the physical properties of matter can be described with tools that measure weight, mass, length, and volume.
Background information:
What you will need for the experiment: kitchen scale, pitcher of water, big glass jar or pitcher, small glass jar, and a large pan
Step 1: Place the kitchen scale into the large pan . Place the large jar onto the kitchen scale. Next, fill the big jar with water (put the water all the way to the rim of the jar without overflowing the water). Write down the weight.
Step 2: Float the small jar in the big jar. This will make the water in the big jar overflow or spill out into the large dish. The weight of the big jar does not change.
Step 3: Carefully remove the big jar and the scale from the large dish. Put the pan on the scale and adjust them to zero. Pour the water that spilled our of the jar when you floated the small jar into the pan.
Step 4: Write down the weight of the water in the pan. Remove the pan and set your scales to zero.
Step 5: Last, weigh the small jar that was floating in the big jar. What you will discover is that it has the same weight as the water that was displaced!
Extra: Look at the picture in the left hand corner of the science book. Why is that man able to float so well? Where do you think he is floating at? Hint: The Dead Sea in Israel
The dead Sea is also known as "The Salt Sea" because it is one of the world's saltest bodies of water with a 33.7% salinity. It is 8.6 times more salty than the ocean. Think about why all that salt helps you to float?
Answers to questions: Some thing float and some do not depending on their mass, and the amount of water they displace when the are placed into water. It does matter what the object is made out of, but mainly it has to do with the amount of displaced water. think about huge ships made of heavy iron and steel; however they are able to float on the ocean, because of the amount of water they displace as the move along. Buoyancy is the upward force that keeps things afloat. Gravity does have something to do with floating. Gravity is the downward force on an object causing the object to want to sink.
Carla Shoemaker and Tabbatha Monroe
Feb. 20, 2010
Questions to think about before we get started:
Why do you think some things will float and some things do not? Does it have anything to do with what the item you are trying to float is made of? What does buoyancy? Does floating or sinking have anything to do with gravity?
Science Standards:
GLE 0407. Inq. 1 Explore different scientific phenomena by asking questions, making logical predictions, planning investigations, and recording data.
GLE 0407.9.1 Collect data to illustrate that the physical properties of matter can be described with tools that measure weight, mass, length, and volume.
Background information:
Why do boats float and rocks sink?
An object will float in water if it displaces enough water, but how much water is enough? You can find this out by collecting the displaced water, and then weighing that water. The water should weigh the same as the floating object.When an object is placed in water, there are two primary forces acting on it. The force of gravity yields a downward force and a buoyancy force yields and upward force. The gravitational force is determined by the objects weight, and the buoyancy force is determined by the the weight of the water displaced by the object when it is placed in the water. More information
Classroom Demonstration Activity: Bring in several pitchers of water. Fill the pitchers about half full. Have different students go around to the pitchers and with pushed up sleeves allow them to place their hand in the bottom of the pitcher. Ask students if they noticed that the water level in the pitcher rose when their hand was on the bottom of the pitcher? Ask them if they take a bath or shower? Tell them that if the take a bath when the fill up the tub they should notice that when the sit in the water the water level will rise, because their body is displacing water. Tell the history story of Archimedes.
Lets Experiment Now:
pg. 18 Find out about floating
Classroom Demonstration Activity: Bring in several pitchers of water. Fill the pitchers about half full. Have different students go around to the pitchers and with pushed up sleeves allow them to place their hand in the bottom of the pitcher. Ask students if they noticed that the water level in the pitcher rose when their hand was on the bottom of the pitcher? Ask them if they take a bath or shower? Tell them that if the take a bath when the fill up the tub they should notice that when the sit in the water the water level will rise, because their body is displacing water. Tell the history story of Archimedes.
Lets Experiment Now:
pg. 18 Find out about floating
What you will need for the experiment: kitchen scale, pitcher of water, big glass jar or pitcher, small glass jar, and a large pan
Step 1: Place the kitchen scale into the large pan . Place the large jar onto the kitchen scale. Next, fill the big jar with water (put the water all the way to the rim of the jar without overflowing the water). Write down the weight.
Step 2: Float the small jar in the big jar. This will make the water in the big jar overflow or spill out into the large dish. The weight of the big jar does not change.
Step 3: Carefully remove the big jar and the scale from the large dish. Put the pan on the scale and adjust them to zero. Pour the water that spilled our of the jar when you floated the small jar into the pan.
Step 4: Write down the weight of the water in the pan. Remove the pan and set your scales to zero.
Step 5: Last, weigh the small jar that was floating in the big jar. What you will discover is that it has the same weight as the water that was displaced!
Extra: Look at the picture in the left hand corner of the science book. Why is that man able to float so well? Where do you think he is floating at? Hint: The Dead Sea in Israel
The dead Sea is also known as "The Salt Sea" because it is one of the world's saltest bodies of water with a 33.7% salinity. It is 8.6 times more salty than the ocean. Think about why all that salt helps you to float?
Answers to questions: Some thing float and some do not depending on their mass, and the amount of water they displace when the are placed into water. It does matter what the object is made out of, but mainly it has to do with the amount of displaced water. think about huge ships made of heavy iron and steel; however they are able to float on the ocean, because of the amount of water they displace as the move along. Buoyancy is the upward force that keeps things afloat. Gravity does have something to do with floating. Gravity is the downward force on an object causing the object to want to sink.
Great job! You did a good job explaining. The pictures are great for explaining each step.
ReplyDeleteSo why is the left over water the same amount as the object?
ReplyDelete:)
Great job! And I love that you colored the water to see it better...kids will like the colors as well!
ReplyDeleteGreat job ladies. This would lead to many questions such as how do you spill the same amount of water as you put in the small glass.
ReplyDeleteGood presentation. Yes why does the left over water weigh as much as the object?
ReplyDelete