1. Practicing with directionality
What direction?
Practicing with directionality

2. Defining Directions Three types of motion
Linear (along a straight line)
Two Dimensional (along a plane)
Three dimensional (Moving left/right, forward/backwards, up/down)
In kinematics, we have to be able to describe the direction of an object’s motion. How do we do this?

3. Linear Motion What is the difference between forward and backwards?
Nothing!!! It’s a matter of perspective
How do we indicate there is a difference?
We say one direction is positive and one direction is negative!
Does it matter which is + and which -?
Not even the tiniest bit!

4. - + Linear motion Include a dual headed arrow
Make one direction positive and one direction negative
How do you describe?
I walked 5 m to the right
I walked 10 m to the left - +

5. Compass
Draw a compass to help you find the answers to these questions.
I am facing North, I turn 90° counter-clockwise. Which direction am I now facing? Is this direction positive or negative?
I am facing South West. I turn counter-clockwise 180°. Which direction am I now facing? Is this direction positive or negative?
I am facing South. I turn three right angles clockwise. Which direction am I now facing? Is this direction positive or negative?
I am facing North West. I turn one and a half right angles clockwise. Which direction am I now facing? Is this direction positive or negative?
I am facing South West. I turn 90°counter-clockwise. Which direction am I now facing? Is this direction positive or negative?

6. Other 2-d angles Reference direction
We can describe any angle that’s given by referencing North, East, South, West and giving a rotation
There are two parts:
Reference direction
Any of the points on a compass (N, E, S, W)
Rotation info
Measure of rotation and direction

7. [rotation of reference]
Two ways to describe
[reference rotation]
[N 30E]
[rotation of reference]
[30E of N]

8. [N30E] or ??
Reference Direction
Rotation of 30 towards east

10. Angles
Complete the Activities on this website to practice measuring angles.

11. Move Around! Complete the following in partners:
Using a compass app on your phone figure out which direction is North.
On a blank piece of paper label the directions of the compass and tape it onto your desk (North must actually be pointing North).
Have one partner wander to another location in the room and stop.
Estimate their displacement by
Determining their direction using your paper.
Estimating how far, in metres, they are from you.
Measure their actual displacement using a metre stick and verifying their direction with a compass app. (we will practice measurement again next week – just do your best)