1. Describing Motion I love physics, but I hate moving. Kinematics

2.  Examine the different ways of relating motion.  Graph and examine position-time for uniform motion.

3. Motion can be described in a lots of ways: Verbal -words to describe position and motion. Symbolic -equations to relate displacement, time and velocity. Numerical - data tables to indicate position at an instant in time. Graphical -graphs giving direct information of position and time.

4. CONSTANT velocity - NO CHANGE in size OR direction. Movement shown in the data table is – UNIFORM MOTION –

5. What is the velocity between 10 and 15 seconds? v = Δd Δt v = v = 2 m/s [E] v = 10 5 30 - 20 15 - 10

6. POSITION (m) TIME (s) 10 20 30 40 50 5 10 1520 25 0 0 Time is plotted on the HORIZONTAL AXIS. Position is plotted on the VERTICAL AXIS. A STRAIGHT line represents UNIFORM motion.

7. POSITION (m) TIME (s) 10 20 30 40 50 5 10 1520 25 0 0 P-T graphs tells where an object is at a given time. The slope of P-T graphs give velocity of the object. RISE RUN Rise: Δd= d 2 - d 1 = 21 - 7 = +14 Run: Δt = t 2 - t 1 = 11 - 4 = +7 v = + 2.0 m/s

8. y 10 20 30 40 50 5 10 1520 25 0 0 x The slope of a line shows the change of one thing compared to another. Slope = x y run rise Slope = Slope = + 2 40 - 10 20- 5

9. Making a Position -Time graph  2 - walker, 7 - timers, 1 - recorder  timers line up 10 metres apart (70 m total distance)  all timers start clock when walker begins  each timer stops clock when runner passes them  walkers must try to maintain a constant velocity  the second walker must walk faster than FIRST.

10. 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.070 63 51 39 27 22 9 0.0 Time (s) Position (m) 0:00 0:09 0:22 0:27 0:39 0:511:03 1:10 Position(m) Time (s)

11. POSITION (m) TIME (s) 10 20 30 40 50 5 10 1520 25 0 0 What is the velocity of the walker? v = v = 2 m/s [E] v = 20 10 v = Δd Δt 50 - 30 25 - 15