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

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Presentation transcript:

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

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

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.

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

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

POSITION (m) TIME (s) Time is plotted on the HORIZONTAL AXIS. Position is plotted on the VERTICAL AXIS. A STRAIGHT line represents UNIFORM motion.

POSITION (m) TIME (s) 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 = = +14 Run: Δt = t 2 - t 1 = = +7 v = m/s

y x The slope of a line shows the change of one thing compared to another. Slope = x y run rise Slope = Slope =

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.

Time (s) Position (m) 0:00 0:09 0:22 0:27 0:39 0:511:03 1:10 Position(m) Time (s)

POSITION (m) TIME (s) What is the velocity of the walker? v = v = 2 m/s [E] v = v = Δd Δt