Page 32 -

Unit summary

Check your knowledge and understanding

1. Calculate the acceleration of a bus if it reaches a speed of 4. From this speed vs. time graph,
36 km/h in 10 s (from rest). determine when an object moves:
textbooks nis edu kz
2. A biker covers the first half of a distance at a speed of 40 km/h, V 1
and the second half at 20 m/s. What is his average velocity over
the whole distance? 2

3. Here is an example of the velocity–time graph for a prototype 3 t
rocket. Use the graph to determine the acceleration of the 0
4
rocket during the three main stages shown below.
5
Velocity vs. time

100 6
80
60
a) with constant acceleration with
40 no initial velocity
velocity (m/s) -20 0 1.0 2.0 4.0 time (s) 6.0 8.0 10.0 12.0 b) with constant acceleration with
20

an initial velocity
-40
-60 c) with constant deceleration with
-80
no initial velocity
-100
d) with constant deceleration with
an initial velocity

Assess your learning

Reflect on how well you met the learning objectives of this unit. Use the worksheet provided by
your teachers to develop your own targets.

How confident am I?

I can …
explain the difference between uniform and non-uniform motion
list 5 examples of non-uniform motion

apply an equation to calculate the acceleration of an object
plot a speed vs. time graph

calculate acceleration using a graph
apply an equation to calculate the average speed of an object

32