Practicing with directionality Three types of motion Linear

Practicing with directionality

� 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?

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

� 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 +

Draw a compass to help you find the answers to these questions. 1. I am facing North, I turn 90° counter-clockwise. Which direction am I now facing? Is this direction positive or negative? 2. I am facing South West. I turn counter-clockwise 180°. Which direction am I now facing? Is this direction positive or negative? 3. I am facing South. I turn three right angles clockwise. Which direction am I now facing? Is this direction positive or negative? 4. 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? 5. I am facing South West. I turn 90°counter-clockwise. Which direction am I now facing? Is this direction positive or negative?

� 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

�[reference �[N rotation] 30 E] �[rotation �[30 E of reference] of N]

Reference Direction Rotation of 30 towards east

Complete the Activities on this website to practice measuring angles. http: //www. mathsisfun. com/geometry/protractor-using. html

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 1. 2. 3. 4. 5. a. b. 6. 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)