# 2. Distance-Time Graphs

# Success Criteria

Your learning has been successful if you can do the following:

Interpret how an object is moving from the shape of its distance-time graph.

Draw distance-time graphs from the description of motion of an object.

Draw distance-time graphs from data obtained in motion experiments.

# Vocabulary

Learn these so you can communicate this concept well.

Constant speed: When an object travels at the same speed without speeding up or slowing down.

Distance-time graph: This shows how the distance travelled by an onject changes over time.

Horizontal axis: The line on a graph that runs from left to right.

Stationary: When an object is not moving at all.

Vertical axis: The line on a graph that runs from bottom to top.

Do Now on page 10 of your PESS1.2 SciPAD:

Answer Questions 1a, 1b, 2a, 2b, 3a and 3b.

Answer the rest if you finish quickly.

Find some space on page 13 of your PESS1.2 SciPAD,

and answer the following questions:

What is the difference between constant speed and average speed?

## Distance-Time Graphs

The distance an object has moved at different times, can be plotted on a DISTANCE-TIME GRAPH. In a distance-time graph, the VERTICAL AXIS is used for distance, while the HORIZONTAL AXIS is used for time.

For example, if a car travels at a CONSTANT SPEED of 50 km/h for seven hours and you record the distance and time on a chart, you will get data like this:

## What do the Shapes of Distance-Time Graphs Tell Us

## Rules for When Drawing Line Graphs

# Tasks & Homework

## Task 1: PESS1.2 SciPAD

## Page 11 - Distance Time Graphs

## Page 12-13 - Team New Zealand Secondary Schools

## In-Class Practical

SciPAD page 16 - Measuring Motion.

You will be working in groups of 3 students to complete this investigation.

We will continue SciPAD page 17 in the next lesson.