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## PowerPoint Slideshow about ' Interpreting Motion' - jin-garrison

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### Interpreting Motion

How to read a Velocity vs. Time graph

Velocity vs.Time graphs

v

v

t

t

Constant negative acceleration but object has changed direction (WHY?)

Constant negative acceleration

If you want to know what the average acceleration is calculate the slope.

Slope = Δv / Δt = aave

Δv = vf - vi

Δt = tf - ti

Using slope to predict motion calculate the slope.

- On a velocity vs. time graph
- If slope is 0, then acceleration is 0. The velocity is constant.
- If slope is positive, acceleration is constant.
- If slope is negative, acceleration is constant in the opposite direction.

Is the object changing speed? calculate the slope.

- You must consider both the direction of the velocity and the direction of the acceleration.
- If velocity and acceleration are in the same direction object is speeding up.
- If the velocity and acceleration are in opposite direction object is slowing down.

Speeding up calculate the slope.

v

Is the velocity positive or negative?

+v

+a

Is the acceleration positive or negative?

t

0

-a

-v

The sign for a and v are the same so both objects are speeding up!

Slowing calculate the slope.down (deceleration)

v

Is the velocity positive or negative?

+v

-a

Is the acceleration positive or negative?

t

0

-v

+a

The sign for a and v are opposite so both objects are slowing down!

Finding calculate the slope.Displacement

- Equal to the “area under the curve” on a v vs. t graph
- Triangle A = ½ b×h
- Rectangle A = l×w
- Base and length are measured in s.
- Height and width are measured in m/s.
Area = (m/s)(s) = m

V (m/s) calculate the slope.

Area = l × w

length = 3 s width = 50 m/s

50

Δd=150 m

3s ×50 m/s

t (s)

1 2 3 4 5 6 7

-25

Velocity vs. Time Graphs calculate the slope.

- The slope of the line tells you the ____________ of the object.
- The “area under the curve” represents the change in position or ____________of an object.

displacement

acceleration

pg 93 #13,15-16 and section review #1-2,4 calculate the slope.

On your own…
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