11.3 Reading real-life graphs · Unit 11 Graphs

1 · Teaching slidesuse ← → keys

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2 · Key words

conversion graphA graph for changing one unit into another.

distance–time graphA graph of how far something has travelled against time.

rateHow much one quantity changes per unit of another.

scaleWhat one square on an axis is worth.

average speedTotal distance divided by total time.

3 · Summary of the sectionrevise from this

Before reading anything, check what each axis shows and what one square is worth.
A conversion graph goes through the origin, because 0 of one unit is 0 of the other.
A graph with a fixed charge does not start at the origin — the intercept is that charge.
On a distance–time graph, the gradient is the speed.
A steeper line means faster; a flat section means stopped.
A line going down means returning towards the start.
Average speed = total distance ÷ total time.
Read from the graph carefully: on a large scale, one square out is a big error.

PDFPrintable worksheet All 40 questions, space to work PDFWorked answers Full solutions, not just the answer

Video lessons2 videos

Real-life Linear Graphs

British corbettmaths

Reading conversion and charge graphs, and what the gradient means in context.

Line Graphs

British corbettmaths

Reading values off a line graph, and the questions usually asked about one.

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Reading real-life graphs