Presentation (Powerpoint) File
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Here is a fun pullback toy car lab that aligns with the NGSS MS-PS3-1 and HS-PS3-1 dealing with speed, potential energy, kinetic energy and mass. The speed equation is introduced and sample problems are included. The lab involves setting up a starting line, finish line and pullback point and the students do 24 runs of 6 each.
The first six runs involve finding the mass of the car and the maximum pullback distance/potential energy. The second six runs use the same car and half of the pullback distance so less potential energy. Then the students add pennies or gram masses to their cars and use the maximum pullback distance for the next six runs. The last six runs use the cars with the pennies but half the pullback distance. After they finish they calculate average speeds and plot them on a bar graph. They finish up with reflective questions.
There is a very detailed description for teachers plus answer keys. I send the digital version to my students for their digital interactive notebooks.