1. Acceleration
Acceleration
Velocity-time graph
Questions

2. Acceleration
Acceleration tells you how quick the velocity of an object is changing, we calculate it using the formula,
𝐴= 𝑉−𝑈 𝑇
A – acceleration ( 𝑚/𝑠 2 )
V-final velocity(m/s)
U-initial velocity (m/s)
T- time taken for change (s)

3. Acceleration
𝐴= 𝑉−𝑈 𝑇
Means:
acceleration= 𝐶ℎ𝑎𝑛𝑔𝑒 𝑖𝑛 𝑣𝑒𝑙𝑜𝑐𝑖𝑡𝑦 𝑇𝑖𝑚𝑒

4. Acceleration When an object speeds up it is accelerating
When an object slows down it is decelerating
When an object has a constant velocity it is not accelerating

5. Velocity-time graph 40 30 20 10
Velocity(m/s)
Time(s)
This graph shows us that the car accelerated for 0-40m/s in 10 seconds
It also shows us that the car then stayed at velocity of 40m/s for 20 seconds before slowing from 40-0m/s in 20 seconds

6. Velocity-time graph C B D A40 30 20 10 C B
Velocity(m/s) D A
Time(s)
We can calculate the acceleration using the gradient of the graph.
The acceleration between point A and B is:
𝐴= 𝑉−𝑈 𝑇
𝐴= 40−0 10
𝐴=4 𝑚/𝑠 2

7. Velocity-time graph C B D A40 30 20 10 C B
Velocity(m/s) D A
We can calculate the distance an object has moved by finding the area under the graph, for example,
Between point A and B the area under the graph: 40× = 200m

8. Question time What is the formula for acceleration? C B
2) How far did the object move between point B and C?
3) What was the deceleration between point C and D? 40 30 20 10 C B
Velocity(m/s) D A
Time(s)