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## PowerPoint Slideshow about '3. Describing Motion' - gay

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Picturing Motion

- Motion diagrams

Ticker Tape illustrating constant velocity

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

Ticker Tape illustrating constant acceleration

* * * * * * * * * * *

Picturing Motion

- Motion Diagrams
- Vectors illustrating constant velocity
- Vectors illustrating constant acceleration

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

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

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 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 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?

- 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

- 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

- 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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