Life Through a Lens Unit Benchmark

With the central heating on, Darcy's living room should be a comfortable 19*C, but the room only reaches 16*C - which is too cold. Darcy realizes that warm air is escaping through a gap underneath the door. She decides to make a device called a DRAFT EXCLUDER ( a fabric tube stuffed with foam) to keep the warm air inside the room and the cold air outside.

Match the variables.

Darcy makes two draft excluders using different thicknesses of foam. One is 20mm thick, the other is 40mm thick. She tests the 20mm draft excluder one night and the 40mm draft excluder the next night. She collects the data as seen in the data table.

Which statement below best explains the relationship between the thickness of the draft excluder and energy transfer?

Darcy wants to improve her design to better meet her criteria: her design should not allow temperature in the room to go below 19*C. She cannot create an expensive device. She collects additional data on the costs of different materials. (Seen in image)

Which design improvement could she make to better meet her criteria while also meeting her constraint?

Abby sets up an investigation using cold water and hot water. She puts three drops of red food dye in each glass and waits 10 seconds. The results are shown in the image.

Describe the relationship between the temperature of the water and the energy of the water molecules in the system?

Ally's car becomes uncomfortably hot during the summer if she can't park in the shade. She wants to design a cover for her windshield to keep the car cool when she has to park it in the sun. She can only spend $10 on materials and has one week to make a prototype.

Drag the blur to the correct box below.

Alyssa investigates what happens when she drops ink on the paper towel that has been dipped in boiling water and on a paper towel that has been dipped in cold water. Her results are shown in the image.

Alyssa claims it is possible to figure out which test used boiling water just by looking at the results of both tests.

Click on the word that best completed the sentences below.

A company decides to design a lunch box that keeps food cold for students with long bus rides.

The criteria: Keeps food at temperature of less than 4*C

The constraint: Costs less than $6 per box to produce

The designers line three boxes with different amounts of material to determine which is the most effective at reducing energy transfer.

They test the designs by putting a frozen ice pack inside each lunch box along with a thermometer. All of the lunch boxes are placed in a temperature-controlled room at 16*C. An hour later the temperature inside each lunch box is recorded. The results are shown in the image.

Which design best meets the criteria?

What is the criteria?

What is the constraint?

What is the independent variable?

What is the dependent variable?

You set up your experiment so there is a tube under each of the two different floor materials. You run hot water under each floor material for 1 hour. The results are shown in the image.

Explain how the results from the investigation show that there is a relationship between the temperature and the types of floor materials.

What is the independent variable?

What is the dependent variable?

How does the data from the investigation show that there is a relationship between temperature and thickness of the material?

Would you choose tile or carpet? Why?

Which thickness (5mm/10mm/20mm) would you choose? Why?