PAGE EDITORS: Sabrina Pereira, Isa O'Sullivan, Ariela Schechter, and Ben Ertel

Natland Note: (01/16/14)
  • posting an image and small video of the water jetpack would be nice
  • make sure to get the notes up here
  • post some images and relevant videos, like the ones I have posted
  • REMEMBER: before next week, someone from this group (or a few of you) need to come in to get sample problems to post and answer on this page before the double quiz.
  • Decide who will post and create the video. Have that person talk to me

  • Remember to have everyone post something. I look into the history to see what people posted and who is contributing. If you are not posting, you will NOT get a good grade for this assignment!


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Physics Conservation of momentum.gif
(This image demonstates the conservation of momentum. Because the momentum needs to be conserved, the canon goes backwards to counteract the forward momentum of the ball. P= P0 so the mballvbball = mcannon vcannon. This is similar to frozen lake example with a shoe that we did in class)


Physics football center of mass.gif

In football, a player trying to make a tackler will try and bring a player down by going for his legs. This is because players can generate the most force from where there center of mass is. Defenders want to maximize the force against the player and will dive down to make the tackle because it is easier to tackle someone by their feet rather than their upper body.

external image u4l2e1.gif

WEBSITES: (5:47)
("Mythbusters - Car crash force". Just awesome. Is one car driving into a wall identical to two identical cars running into each other at the same speed? Watch and see!) (2:28)
("First Institute Crash Tests of the Smart Car". This shows some nice video of sample car-crash tests used to determine "crashworthiness") (2:34)
("Safety Consequences of Vehicle Size and Weight". This video, made by the Insurance Institute of Highway Safety, discusses how good crash ratings don't necessarily mean that, realistically, the car is safer. Watch this video!) (2:29)
("Small overlap test results for small SUVs - IIHS news") (1:58)
("2009 Chevy Malibu vs 1959 Bel Air Crash Test." See how far car technology has come!) (1:43)
("SUVs and Pickups pose less risk to people in crashes." This video, put out by the Insurance Institute of Highway Safety, discusses changes in car design to increase safety of occupants, including videos of crash-dummy tests) (22:15)
("Understanding Car Crashes: It's Basic Physics." A short, fun video about car-crash physics involving forces, energy, and momentum.)
(This is a really cool video of a scientist explaining the conservation of momentum from space. In particular, the ending where he explains why he can’t move himself in space is particularly interesting)
(This myth-buster video confirm that conservation of momentum. A soccer ball that is traveling 60 mph on a car will drop straight down when launched in the opposite direction at 60 mph)
(This video shows two carts that are moving on an air track with a spring connected to the two of them. The important part of this video is that the center of mass moves at a constant velocity, even though the carts oscillate back and for)
(This video shows newtons cradle and demonstrates the idea of conservation of momentum and energy through the swinging balls.)
(this video helps visualize center of mass and how different factors affect it)

Conceptual question: Movie Physics Edition Note anything you see in the following movie clip that you think is either accurate or inaccurate from the standpoint of physics. (0:11)
("one inch punch".) (0:53)
("Bruce Lee Strength: One and Six Inch Punch")

JET PACK (Water propelled)

Gravity Assist:
File:Cassini interplanet trajectory.svg
File:Cassini interplanet trajectory.svg

File:Cassini's speed related to Sun.png
File:Cassini's speed related to Sun.png

Caption: Cassini's speed related to Sun. The various gravity assists form visible peaks on the left, while the periodic variation on the right is caused by the spacecraft's orbit around Saturn. The data was from JPL Horizons Ephemeris System. The speed above is in kilometers per second. Note also that the minimum speed achieved during Saturnian orbit is more or less equal to Saturn's own orbital velocity, which is the ~5 km/s velocity which Cassini matched to enter orbit.

Asteroid: Apophis
File:Apophis pass.svg
File:Apophis pass.svg
external image 220px-Apophis_pass_zoom.svg.png
Caption: Close approach of Apophis on April 13, 2029 (as known in February 2005). The white bar indicates uncertainty in the range of positions (as known in February 2005).

external image 250px-Apophis_ellipse.svg.png
Caption: Illustration of a common trend where progressively reduced uncertainty regions result in an asteroid impact probability increasing followed by a sharp decrease.

(gravity assist pictures)
(apophis pictures)