Victorian Curriculum Link: “Plot graphs of non-linear real life data with and without the use of digital technologies, and interpret and analyse these graphs.” (VCMNA285)
Only one of the containers in this activity shows a constant increase in height of liquid over time. So, only one of the relationships between height of liquid and time is a linear relationship. Which container is it?
This is a useful worksheet to start recognising the relationship between everyday situations and graphs. Which graph is which?
Dan Meyers has some great resources for learning about non-linear graphs too: Graphing Stories is a series of short videos that can be used to demonstrate various non-linear relationships. Here is a student worksheet you can use with the GraphingStories.pdf
More Graphing Stories here.
Matemagi has some more great graphing story videos.