This design challenge, for students in grade 3, focuses on simple and compound machines. The objective of the challenge is to design a compound machine to help a large breed of dog to get into and out of the back of a car.

Researchers should cite this work as follows:

• Brenda Capobianco; Todd Richard Kelley; Chell Nyquist; James Daniel Lehman (2015), "Dog gone it!," https://stemedhub.org/resources/2896.

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1. grade 3
2. lesson plan
3. simple machines
4. sled