Features of the Graph
1. The slope is the speed of the object.
2. If the slope is horizontal the object is not moving. a) run
To calculate the slope:
slope = rise run distance
To calculate the slope
slope = 8 – 6
2 – 1
run = 2 ms-1
Book A mop!, vjJs
Speed vsTime Graph
A change in the speed of an object is called acceleration. If the speed increases the object is accelerating, if it decreases then the object is decelerating. Acceleration is a measure of how
much an object’s speed changes each second. The units are: ms-2. Acceleration (a) can be
calculated by measuring the change in speed over a given time interval:
This means the acceleration equals the change in speed divided by the change in time.
Speed versus time graphs show how fast an object is moving.
Features of the Graph:
Speed versus Time Graph
The slope is the acceleration of the object.
If the slope is horizontal the object is moving at constant speed.
v) To calculate the slope:
acceleration = rise
= 10 – 0
5 – 0
= 2 ms-1
The area under a speed time graph is the distance travelled.
Area = 1/2. b . h
= 1/2 . 5 . 10