Energy systems

Invent-a-Wheel

8. A Test Drive

Overview

Students compare their cars with one another’s cars, by rolling them down ramps to see what happens. They develop vocabulary to describe what happens.

Advance Preparation

Students’ cars from Lesson 7
For each pair of students: a Ramp and ramp stand for testing cars.

Procedure

1.

How did it work? Review what has happened so far: students have had ramps that a sled wouldn’t go down. They helped the sled go down by putting rollers underneath, but at the bottom of the ramp, the rollers broke loose, and the sled couldn’t keep going. Finally, they invented ways to attach round things, wheels, to the sleds. These ways allowed the wheels to turn, but not leave the sled. This turned the sled into a car. Ask:

What’s an experiment we can do to see how our cars compare with each other?
Model an experiment for them, by comparing two cars made in Lesson 7:
Which car will go furthest
Which one will go straightest?
Use a class chart to record results. Generate more questions that could be tested. Then have students pick a partner and a question that they want to test. After doing the experiment with a partner, discuss briefly what happened.

2.

Comparing cars. As the students are testing their cars against each other, help them develop language for comparing the results:

Some cars go straight, but other cars go in curves.
Some cars go far, but some don’t go as far
Some cars stay together, but some come apart.

3.

Storage: Make sure each car is labeled with stored in a plastic bag, as in Lesson 7.

4.

Science Notebook

What was your question in your experiment with your partner?
How did your car compare with other cars?
What other questions do you have?

5.

Outcomes

Students design an experiment for comparing cars with each other.
Students develop and use language for comparing the performances of their cars.