Distance-Time Graphs

Distinguish between constant velocity, increasing velocity and decreasing velocity on graphs

Determine the velocity of an object

Description of motion	Time (s)	Cumulative time (s)	Distance (m)	Distance from start (m)
still	0	0	0	0
Walk	7.72	7.72	10	10
Run	3.15	10.87	10	20
Stop	10	20.87	0	20
Walk	6	26.87	10	30
Jog	4.87	31.74	10	40
Run	2.9	34.64	10	50
Walk	7.13	41.77	10	60
$\frac{60}{41.77}=1.44m/s$ N/E/S/W
Make sure to use displacement not distance when calculating velocity. Here, they are the same.

Describe specific ways to improve the validity and reliability of the data

Construct and analyse a range of distance-time graphs

Person A
Description of motion	Time (s)	Cumulative time (s)	Distance (m)	Distance from start (m)
still	0	0	0	0
Walk	7.72	7.72	10	10
Run	3.15	10.87	10	20
Stop	10	20.87	0	20
Walk	6	26.87	10	30
Jog	4.87	31.74	10	40
Run	2.9	34.64	10	50
Walk	7.13	41.77	10	60

Person B
Description of motion	Time (s)	Cumulative time (s)	Distance (m)	Distance from start (m)
still	0	0	0	0
Walk	6	6	10	10
Run	3.16	9.16	10	20
Stop	10	19.16	0	20
Walk	5.16	24.32	10	30
Turn around and jog	3.03	27.35	10	20
Run	2.63	29.98	10	10
Walk	5.79	35.77	10	0

Analyse a distance time graph

Examples
When is Person A at rest?
From 10-19 seconds

When is Person B at rest?
From 12-20 seconds

When is Person A increasing their velocity?
Well, it’s not really a detailed graph, but probably at 0, 10, 27, 31, 34.