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# Real-life Graphs

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## Real-life Graphs

The two types of graphs you will meet are **distance/time** and **speed/time.**

Time is almost always plotted on the **x-axis!**

**If you show a graph of a journey showing distance travelled (on the y-axis) against time (on the x-axis):**

**1.** The **gradient** (or slope) of the graph represents the **speed**.

**2. **A horizontal section indicates that you have stopped.

**3. **A section sloping up means you are going away.

**4. **A section sloping down means you are coming back.

**5. **The steeper the line, the faster you are going.

**1.** The **gradient** (or slope) of the graph represents the **acceleration.**

**2.** The **area** under the graph (for any section) is the **distance travelled** (in that section).

**3.** A horizontal section indicates constant speed (no acceleration).

**4.** A section sloping up means accelerating.

**5.** A section sloping down means slowing down.

**6.** The steeper the line, the quicker the acceleration.

**Graphs used to represent data include:**

**Bar charts**(sometimes called frequency diagrams)**Line graphs****Frequency polygons****Cumulative frequency graphs****Scatter diagrams**

These are all covered in the section **Representing Data.**