Graph Type	Gradient Means	Units
Distance-time	Instantaneous speed	m/s, km/h
Speed-time (velocity-time)	Acceleration (or deceleration if negative)	m/s²
Temperature-time	Rate of heating or cooling	°C/min, °C/s
Population-time	Rate of population growth	people/year

Positive gradient: quantity is increasing. Negative gradient: quantity is decreasing. Zero gradient: turning point (max or min), rate of change is zero at that instant.

This deep dive covers Interpreting the Gradient in Context within Gradients of Curves for GCSE Mathematics. Revise Gradients of Curves in Graphs for GCSE Mathematics with 9 exam-style questions and 10 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 4 of 10 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.

Practice questions for Gradients of Curves

How do you find the gradient of a curve at a specific point?

A. Draw a chord joining two points on the curve and find its gradient
B. Draw a tangent to the curve at that point and find the gradient of the tangent
C. Find the average of the y-values on either side of the point
D. Divide the y-coordinate by the x-coordinate of the point

1 markfoundation

Explain why the gradient of a chord between two points on a curve is only an estimate of the gradient at a point, and how this estimate can be improved.

2 markshigher

Quick recall flashcards

Steps to estimate the gradient of a curve at a point

1. Mark the point on the curve 2. Place a ruler so it just TOUCHES the curve at that point (tangent) 3. Make the tangent line extend well across the graph 4. Choose two clear points on the tangent line 5. Calculate: gradient = (y2 - y1)/(x2 - x1) Tip: use points far apart on the tangent for greater accuracy.

What is a tangent to a curve?

A straight line that touches the curve at exactly one point and has the same gradient as the curve at that point. It does NOT cross through the curve at that point — it only touches it. The gradient of the tangent = the gradient of the curve at that point. Used to estimate the rate of change at an instant.

Drawing a Tangent to Estimate Gradient

Chord vs Tangent — Average vs Instantaneous Rate

Interpreting the Gradient in Context

Practice questions for Gradients of Curves

Quick recall flashcards

9 questions on Gradients of Curves: practise free