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Kendra Ferron

on 17 January 2013

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Transcript of Kitties

Greek cats used to resolve rodent infestation
First domesticated cats in 900 BC in Europe
Egyptians sold cats to Romans, Gaels, Celts, etc.
Common in China by 500 BC African Wild Cat- Earliest ancestor of the cat (Felis sylvestris lybica)
Genetically indistinguishable from the house cat
European Wild Cat (Felis sylvestris sylvestris)
Genetically distinguishable from the house cat Cats turned into feline deities
'Miw' - Embalmed and buried in coffins
Linked to Sekhmet, goddess of war
Linked to Ra, sun god Present as early as 3000 B.C.
Cats were attracted to the banks of the Nile
With their friendly nature people had desire to domesticate them Egypt History of Kitties By Mai Li O'Keefe and Kendra Ferron Kitties "I used to pretend to kick my cat when I walked by, but he's dead now..."
-Joe Kelly
RIP Magic Kelly Physics of Kitties Scientific Method Interview The Problem
What is the most strenuous activity for kitties in terms of PHYSICS? Hypothesis
We hypothesize that jumping will be the most strenuous activity for the kitty Scientific Method (Cont'd.) Independent Variable: Distance
Dependent Variable: Time
Control: The kitty, Mr. Buckles
Materials: Kitty, toy, food/treat (optional), meter stick, stopwatch
Jumping: 1. Prep apparatus. 2. Mark where 200 cm is above a flat surface. 3. Excite the kitty by using a toy. 4. Time how long it takes Mr. Buckles to reach 200 cm (0.2 m)
Running: 1. Prep apparatus. 2. Measure 2 meters on a flat surface. 3. Set out a treat at the end point for motivation. 4. Time how long it takes Mr. Buckles to travel 2 m Thank you for your attention!
Kendra, Mai Li, & Mr. Buckles Linear Motion: Kitties are constantly walking/running
v = d/t [m/s]
d = vt + 1/2at^2
V(f) = V(o) + at
Projectile Motion: A kitty can jump for a toy or on a ledge
t = 2 x (2y/g)^0.5 (Hang time)
y = Vt + 0.5gt^2 Motion: Linear & Projectile Newton's Laws Newton's 1st Law: Inertia
A kitty's motion will tend to stay the same unless an exterior force acts upon
Newton's 2nd Law: F = ma
A kitty's acceleration is gravity (on earth) and the mass varies depending on the kitty
Newton's 3rd Law: Action/Reaction
For every action a kitty does, there is an equal & opposite force
eg a kitty hits a ball, the ball exerts a force on the kitty Momentum Inertia in motion
A kitty changes velocity, changing its momentum
p = mv
Mass is constant
Impulse: change in momentum; kitties change momentum
J = Ft Friction Static Friction: resists the initiation of the sliding motion of kitty at rest
eg Joe kicks Magic when he's napping
Kinetic Friction: opposes kitty's movement
eg a kitty's claw gets stuck in a shirt
Ff = mFn Work, Power, & Energy Work = Fd; kitties move & lift objects, like treats & toys, doing work
Power: the rate of work; P = W/t
Kitties can move/lift objects quicker
Energy: the ability to do work
Kitties specifically have kinetic energy; KE = 0.5mv^2
Kitties also can have potential energy; PE = mgh
Conservation of Energy: PE = KE, a kitty ready to pounce on its prey has a higher PE but transfers its energy to KE Data Mr. Buckles' Mass: 5 kg
Time to walk 2 m
Trial 1: 3.44 s
Trial 2: 3.69 s
Trial 3: 4.01 s
Average: 3.71 s
Time to reach 1 m (jump)
Trial 1: 0.69 s
Trial 2: 0.43 s
Trial 3: 0.58 s
Average: 0.57 s Calculations Velocity = 2/3.71 = 0.54 m/s
Force = 5 x 10 = 50 N
Projectile: 1 = 0.57v + 0.5 x -10 x 0.57^2; v = 4.6 m/s
Momentum = 5 x 0.54 = 2.7 kgm/s
Impulse = 50 x 3.71 = 185.5
Work = 50 x 2 = 100 J
Power = 100/3.71 = 27 W
PE = 5 x 10 x 1.57 = 78.5 J
KE (linear)= 0.5 x 5 x 0.54^2 = 0.729 J
KE (projectile): = 0.5 x 5 x 4.6^2 = 52.9 J Conclusion After conducting our experiment, we can conclude that our hypothesis was correct. Through a series of calculations, we found that because Mr. Buckles had a larger velocity when jumping, she consequently had more kinetic energy (which is how we defined the "strenuous" activities). Inaccurate timing may have impacted the results of our experiment as well as Mr. Buckles' exhaustion levels. Furthermore, Bucky's height/distance could have varied slightly between the various trials. The variable was not controlled, therefore could have impacted the end result. Q: What is your preferred breed of cat and why?
A: Siamese, because I like their eyes.
Q: What qualities attribute to a good cat?
A: Playfulness, friendliness, and willingness to sit on your lap like Bucky does.
Q: What is your favorite thing about Mr. Buckles?
A: My favorite thing about her is how social she is and when I'm the only one home and she follows me everywhere.
Q: What makes cats better than dogs?
A: That's a super tough question..um...dogs are really smart, but cat's, especially Bucky, are more playful than most dogs
Q: What qualities of cats do you think make them more able to survive in the wild?
A: Their ability to hunt and their quickness.
Q: What do you thin.k is the most strenuous activity for a cat?
A: When Bucky jumps around and twists in the air while playing with the squirrel tail on the string. She gets really tired.
.Q: What is your favorite cat toy to play with with Mr. Buckles?
A: Catnip and the squirrel tail on the string.
. Mr. Buckles Works Cited "A Short History of the Cat." Purina. N.p.. Web. 6 Dec 2012. <http://www.purina.co.za/Home/All About Cats/Your New Pet Cat/Choosing a Cat/A Short History Of The Cat.htm>.
Garman, Andrew. "History of the Wild Cats." Dial Space. N.p.. Web. 6 Dec 2012. <http://dialspace.dial.pipex.com/agarman/bco1b.htm>.
Kaufman, Marc. "Scientists Learn Physics Behind How Cats Drink Water Without Getting Wet." Washington Post. Washington Post, 12 2010. Web. 6 Dec 2012. <http://www.washingtonpost.com/wpdyn/content/article/2010/11/11/AR2010111104952.html>.
Krysac, L.C. Gravitational, Electric, and Magnetic Forces. New York: The Rosen Publishing Group, Inc., 2006. 26 - 27. Print.
McGinis, Terri. "Cat - History." 3. Chicago: 2011.
Sprott, JC. "Physics Demonstrations - Motion." . N.p.. Web. 13 Dec 2012. <http://sprott.physics.wisc.edu/demobook/chapter1.htm>.
"The Laws of Physics as Applied to Cats." Cat Stuff. N.p.. Web. 6 Dec 2012. <http://user.xmission.com/~emailbox/physics.htm>.
Zax, David. "A Brief History of House Cats." Smithsonian.com. N.p., 01 2007. Web. 13 Dec 2012. <http://www.smithsonianmag.com/history-archaeology/brief_cats.html>. Steve Liksa
"Cat Enthusiast" Physics & Evolution Natural Selection
Throughout the years, kitties' ideal qualities for survival persist and develop, oftentimes relating to physics
Depends on the type of cat & environment
Although physics does not 'directly' enhance a kitty's performance (as with a sport), it contributes to the kitty's overall capability of survival Types of Kitties Subfamily Felinae: Small cats including domestic cat, puma, cheetahs, lynx, etc.
Subfamily Pantherinae: Large cats including leopards, lions, jaguars, & tigers Kitty Fun Facts A group of cats is called a "clowder"
Kitties spend about 2/3 of their life sleeping
Kitties produce about 100 different sounds
A cat can jump about 5 times its own height
The largest litter ever produced had 19 kittens in it
First Cat Show: London in 1871
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