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3. Describing Motion. Includes references to PS#3-1 and 4-1. Picturing Motion. Motion diagrams. Ticker Tape illustrating constant velocity. * * * * * * * * * * * * * * * * * *. Ticker Tape illustrating constant acceleration.

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3 describing motion

3. Describing Motion

Includes references to

PS#3-1 and 4-1


Picturing motion
Picturing Motion

  • Motion diagrams

Ticker Tape illustrating constant velocity

* * * * * * * * * * * * * * * * * *

Ticker Tape illustrating constant acceleration

* * * * * * * * * * *


Picturing motion1
Picturing Motion

  • Motion Diagrams

  • Vectors illustrating constant velocity

  • Vectors illustrating constant acceleration

---> ---> ---> ---> ---> ---> ---> ---> ---> ---> ---> ---> --->

-> --> ---> ----> -----> ------> -------> --------> --------->


Speed distance time
Speed, Distance, Time

  • Speed is a scalar quantity. A quantity that has only magnitude. (a number plus a unit)

  • For example: 10 mi/h, 12 km/h, 5 m/s

  • Average Speed: The ratio of the total distance divided by the time.

  • Average Speed = distance / time


Velocity displacement time
Velocity, displacement, time

  • Velocity is a vector quantity. A quantity that has both magnitude and direction. (A number, a unit, and a direction)

  • For Example: 6.5 m/s, East

  • Average Velocity: The ratio of the change in position to the time interval during …

  • v(ave) = displacement / time

  • displacement = d(f) - d(i) OR d - d(o)


Acceleration v time
Acceleration, /\v, time

  • Acceleration is a vector quantity. A quantity that has both magnitude and direction

  • For Example: 12 mi/h/s, East and

  • +3 m/s/s which means 3 m/s/s forward

  • Average Acceleration: The change in average velocity divided by time

  • Acceleration = /\v / t

  • And /\v = v(f) - v(i) OR v - v(o)


What s up with m s s
What’s up with m/s/s?

  • A unit of acceleration is a change in velocity (I.e. m/s) divided by time (I.e. s)

  • When a fraction like m/s is divided a value like s, the rule says to invert and multiply

  • So a unit like m/s/s may be written as m/s^2, where the m/s is being divided by the second, and because of the invert and multiply rule for fractions its m/s^2


Working with ps 3 1
Working with PS#3-1

  • Let s represent speed, v(ave) may be used

  • 1a-e, s = d / t

  • 2a-e, d = s * t

  • 3a-e, t = d / s

  • 4a-e, v(ave) = d / /\t, bold type = vector

  • 5a-e, /\t = d / v(ave)

  • 6a-e, d = v(ave) * /\t


Working with ps 4 1
Working with PS#4-1

  • 1a-e, a(ave) = /\v / /\t

  • 2a-e, /\v = a(ave) * /\t

  • 3a-e, /\t = /\v / a(ave)

  • 4a-e, a(ave) = [v - v(o)] / /\t

  • 5a-e, v = a * /\t + v(o)

  • 6a-e, v(o) = v - a * /\t


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