ETS1-4

1. You have designed several thermoses for keeping liquids hot. You want to design a test to see which device works best. Which is the best practice?

• Measure the temperature of the liquids in all the thermoses and compare temperature change
• Touch the liquid with your finger to see if it feels warm or cold
• Draw a picture of the thermos
• Make no changes to your prototype

2. You have a high ramp, a low ramp, and a medium ramp. You are going to roll a toy car down and measure how far it goes with each ramp. What should we record in our data?

• The height of the first ramp only
• The distance in centimeters that the car travels when released from each ramp
• How long in seconds it takes the car to travel from the top of the tallest ramp to the bottom of that ramp
• All of the above

3. After testing your prototype of a balloon-powered car, you determine that the cars with a lightweight body travel the farthest. You will now

• Modify the car prototype, so that the body is made of a 2x4 piece of wood
• Modify the car prototype, so it has a larger balloon that holds more air
• Make no modifications to the car prototype
• Modify the car prototype to have a lightweight body, such as an empty plastic water bottle

4. When you are testing a tool you should

• Record data
• Make comparisons
• Adjust your design
• Retest the new design
• All of the above

5. You and your classmates have made solar ovens. The goal was to convert sunlight to heat energy. How can you test the devices to see which one works best?

• Place the solar ovens in the shade and see if they heat up
• Place a different item in each solar oven to see which one melts first
• Place the same item in each solar oven and put the solar oven in the Sun
• All of these