Upcoming Deadlines Sixth Homework (Stop-motion Animation) Due Tuesday, February 28 th (Next week) 20 points (if late, 10 points) Bonus prize of 20 extra points to top three. Seventh Homework (Outline of First Term Paper) Due Tuesday, March 6 th (In two weeks) 10 points (if late, 5 points) For full schedule, visit course website: ArtPhysics123.pbworks.com Pick up a clicker, find the right channel, and enter Student ID
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Upcoming Deadlines Sixth Homework (Stop-motion Animation) Due Tuesday, February 28 th (Next week) 20 points (if late, 10 points) Bonus prize of 20 extra.
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Upcoming Deadlines
Sixth Homework (Stop-motion Animation)Due Tuesday, February 28th (Next week)20 points (if late, 10 points)Bonus prize of 20 extra points to top three.
Seventh Homework (Outline of First Term Paper)Due Tuesday, March 6th (In two weeks)10 points (if late, 5 points)
For full schedule, visit course website:ArtPhysics123.pbworks.com
Pick up a clicker, find the right channel, and enter Student ID
Homework Assignment #6
In this assignment you will create a stop-motion animation of a falling object.
It can be a simple as a ball bounce cycle or (preferably) something more interesting, like a flour sack or a water balloon.
Because you will have to pose your object at different heights, you'll either need to suspend it from a string or have the motion occur on the ground with the camera positioned directly overhead.
Homework Assignment #6
If you have a webcam, an easy way to film a stop-motion animation is to use SAM Animation (http://www.samanimation.com/).
It's free software that runs on both Macs and PCs; it was developed at Tufts University as part of a National Science Foundation project for teaching using animation.
The software is designed so that it can be used by even elementary school children so you shouldn't have much trouble figuring it out.
Homework Assignment #6
Homework Assignment #6While I encourage you to help each other out, for this
assignment each person needs to create their own animation.
Finally, describe in a brief paragraph how you created your animation. Post your animation clip to your blog in an entry entitled "Stop Motion Animation of Falling.“
Due by 8am on Tuesday, February 28th
20 points (if late, 10 points)
The top three animation clips in the class will receive a bonus of 20 extra points.
Extra Credit Opportunity
Academy Award Nominated Animated Short Films
Camera 3 theater in downtown San Jose
Turn in your ticket stub for 5 points extra credit.
Extra Credit Opportunity
Art of Dreamworks’ Puss in Boots at the Cartoon Art Museum in San Francisco.
For info: cartoonart.org
Turn in proof of your attendance to this exhibition (e.g., ticket receipt) for 10 points extra credit.
Extra Credit Opportunity
See Chico and Rita, now playing at Camera 12 in downtown San Jose.
Turn in your ticket stub for 5 points extra credit.
Survey Question
You have some experience with creating stop-motion animation.
True or False?
The League of Extraordinary Gentlemen (2003)
In this scene, Sean Connery jumps out the side of a speeding car and lands on his feet.
Two forces pulling an object are equivalent to a single total force.
Object Force A
Force B
Net ForceA + B
Sliding Sideways
If leaf/paper is tilted then it
slides sideways.
Air Pressure Force
Gravity
Slides this way
Picks up speed (slows out) as it slides down, as if it were sliding down an incline.
Aerodynamic Lift
If airflow is faster over one side than the other then a pressure difference develops, creating aerodynamic lift.
Wing
Moving this way
Lift Lift
Aerodynamic Lift
If leaf/paper is tilted relative to its path of action then there is also an aerodynamic lift.
Air Resistance
Gravity
Moving this way
Lift Also get lift if leaf/paper is curled like a wing.
Effect of Lift
Path of action deflected by lift.
Lift
No Lift
Lift force can also deflect the path of action downward, depending on the tilt angle of the leaf/paper.
Lift requires tilt and speed; no lift if
paper/ leaf is not moving
Bernoulli’s Principle
Where the speed of a fluid increases the pressure in the fluid decreases.
This phenomenon is due to energy conservation; when fluid’s kinetic energy increases (velocity increases) its internal potential energy (pressure) decreases.
A
L
Still Air
Win
d
Home Demo: Blow It Up
Hold a sheet of paper in front of your mouth and blow; the paper will rise.
L
ALow pressure on top; Average pressure on bottom
Waves and Bernoulli’s PrincipleWind blowing over the ocean causes waves to build due
to Bernoulli’s principle.Where is the pressure lowered?
L
A
L
A A
Air moves fastest at the tops of the waves so pressure is lowest there.The lower portion of the wave is blocked from the wind so air above the water is at atmospheric pressure.
Blow the Roof
If wind blows hard enough the low pressure above can create a large enough force to lift the roof off.
New Orlean’s Superdome after hurricane Katrina
L
A
Aerodynamics for Race Cars
Airfoil on a race car is an upside-down wing that increases traction (friction) by increasing downward pressure.
Demo: Throwing You a CurvePutting a spin on a thrown baseball causes the airflow to be faster on one
side than the other, which creates a pressure difference.
No Spin
Forward Motion
L
LL
H
Bernoulli
Spin
Depending on the axis of rotation this could be a rising fastball, a sinker, or a curve ball.
Curveball Flow Pattern
L
H
Class Demo: Blow the Funnel
Blow hard through a funnel with a ping pong ball in the funnel’s bowl.
Instead of being blown away, the ball is held tightly in the bowl.
PingPongBall
BLOW
L
A
L
Home Demo: Keep It Up (cont.)Bernoulli effect keeps the ball in the middle of the air