# 0922 kinematics by HWLKWPQ8

VIEWS: 4 PAGES: 25

• pg 1
```									    How Small is Small?

Image: http://en.marveldatabase.com/Ant-Man
Monday & Tuesday

Sept. 22 & 23
Vocabulary Sheets Due
Sept. 24
Energy Super Heroes
Presentations start on Sept. 24
40%           Accuracy of your presented physics solution

20%           Submitted project paperwork: turn in your presentation
materials (PowerPoint file in most cases); all of the
problems, solved completely and neatly; and your Energy
vocabulary sheet
20%           Strength of your presentation (both oral and visual style will
be considered)

20%           Quality of your supporting information such as background
story and physics explanations

Image: http://www.coverbrowser.com/covers/action-comics
How Far?
The Flash’s position

0

Increasing negative       Increasing positive
position                 position

Position, velocity, and acceleration require reference points.
Distance

0

How do you define distance?
Does it require a reference point?
Distance

0

How do you define distance?
Does it require a reference point?

No. Distance is how far 2 points are separated.
It’s an example of a scalar quantity.

Velocity and acceleration are vector quantities.
How Fast?

0            1000 m
The Flash runs 1000 m in 3 s
What’s his average velocity?
Classwork
• Pages 58-60
(in Chapter 3)
– Applying Concepts
1-4
– Problems 1-3

Image: http://www.coverbrowser.com/covers/the-flash

How fast must Superman fly to circle the globe as fast as shown here?
Displacement
Given velocity and time
Recall:

Rearranging to solve for change in position:
Position vs. Time Graphs
Position vs. Time Graphs
What do these graphs represent?
Position vs. Time Graphs
What do these graphs represent?
Classwork
• Pages 58-60
(in Chapter 3)
– Applying Concepts
6-9
– Problems 4, 6, 9

Image: http://www.coverbrowser.com/covers/the-flash
Wednesday & Thursday

Sept. 24 & 25

Present our “Energy Superhero” projects
Friday

Sept. 26
Kinematics Vocabulary
Due week of
November 3

This week:
•average velocity,
•final velocity,
•frames of
reference,
•initial velocity,
•instantaneous
velocity,
•kinematics,
•mechanics,
•scalar,
•vector
Negative Velocity?
Refer to Example Problem on p. 52.
Velocity vs. Time Graph
Changing it up: put velocity on the y-axis.

velocity

time

What does the corresponding position vs. time graph look like?
Velocity vs. Time Graph
Check out the area under the graph line.

velocity

time

What’s the area of a triangle?
What’s the meaning of this area?
Classwork
• Pages 58-61
(in Chapter 3)
– Applying Concepts
10 & 11
– Problems 21, 23, 25

Image: http://www.coverbrowser.com/covers/the-flash

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