Entry 8: Matthew Lee
	For the force body diagram of the person in the picture, there are four different forces acting on the person. First is the force of gravity exerted by the Earth which points down towards the ground, second is the normal force exerted by the wall pointing out away from the wall, third is friction which is exerted by the surface of the wall on the person's hand, which points up, and last is the tension force exerted by the arm which, at this moment, points downwards but will change to constantly point towards the person's hand as he rotates.

	Entry 9: Michael McCann
	My photo for this year’s contest consists of myself spinning Steve around in order to keep him from touching the ground. The major part of this physics is the spinning. Circular motion of an object (Steve in this case) uses a force called the Centripetal force. This means center seeking force for Steve always has a net force in the direction of the center of the circle which would be where I am standing. The amount of centripetal force Steve has is defined by the equation F=M(V^2/R) where M is Steve’s mass, V is his velocity, R is the radius of the circle around which he is spinning, and F is the force I am using to keep him aloft and spinning. Steve’s velocity is always along a tangent to the circle he is spinning on, so in this case the line he is making with his arms. If I were to stop the centripetal force acting on him by letting go, he would continue along this line and leave the circle then hit the ground. But because I continue to hold on to him, the centripetal force continuously redirects his velocity to different tangents along the circle he is traveling. This allows for him to spin.

	Entry 10: Colin Mitchell
	Non-Newtonian fluid on a Speaker: My series of pictures shows a very peculiar series of events, all based on the properties of the liquid on the plate. The liquid is a mixture of water and cornstarch in a 1 to 2 ratio. When mixed, the two ingredients form what is called a non-Newtonian fluid, which has very different characteristics than a normal liquid. A non-Newtonian fluid has a viscosity that changes depending on the amount of force applied to the fluid, for example when only a little force is applied, the fluid has a resistance like a liquid. But when lots of force is applied, the fluid temporarily acts like a solid. The liquid seems to directly contradict Newton’s laws of motion. In the picture, the non-Newtonian fluid is in a thin metal plate resting on a speaker. In the first picture, the speaker is not playing, so the fluid stays in its normal liquid state. But a special reaction starts to occur when the speaker is turned on and a 120 Hz tone is played. Played at a very high volume, the 120 Hz sound waves cause the thin metal plate to vibrate violently. The violent vibrating can be attributed to the resonance of the plate. At 120 Hz, the sound waves hitting the plate oscillate at a greater amplitude (bigger) than any other frequency. As the plate begins to vibrate, pressure is applied over and over to the fluid on the plate. As a result, the fluid begins to act like a solid, and as it moves with each vibration, the liquid begins to creep upwards, moving like fingers away from the source of the pressure. After a couple of seconds, like a chain reaction, more and more of the fluid begins to act like a solid, until finally the whole thing is moving around like it is alive. When the tone is finally stopped and the pressure from the vibrations is no longer being applied to the fluid, it stops acting like a solid and reverts back to its more liquid like state.

	Entry 11: Austin O'Brien
	The picture submitted is based upon the concept of the center of gravity. The center of gravity is the point in which an object is completely balanced. For example, when a basketball is spun on ones finger, the basketball is spinning on the center of gravity. The fork and spoon are interlocked and a match is placed in between the tongs of the fork. Then the match is placed on the rim of a glass of water (and after a few tries to get it right) the match, fork, and spoon will all be balanced perfectly and be stable there. You can burn the match and let it burn the whole match, and the spoon and fork will still be balanced. This amazing balancing act is possible because the fork and spoon handles are just below the match. This brings the center of gravity to be located just below the match.   Source: http://www.stevespanglerscience.com/experiment/balancing-forks

	Entry 12: Mateo Owen-Rodriguez
	I took a picture of an apple and a cork. I stood up on a chair and dropped both objects at the same time. In the picture both the cork and the Apple are traveling at the same velocity (side by side) until they both hit the floor at the same time. I took this picture to emphasize the law of gravity and how it affects objects with different sizes and masses the same. The rate of acceleration of all objects that are dropped near the gravitational pull of the earth is the same (10 m/s^2). Subsequently, if objects are dropped at different heights the object that is dropped from a higher point will reach greater velocities because it will have more time in the air and the acceleration of gravity or gravity’s pull is causing the object to accelerate and thus increase its velocity as it goes downward. The gravitational pull of the earth is equal to about 10 m/s^2, when ignoring air resistance. Air resistance makes objects with bigger surface areas take longer to hit the ground than they normally would because the air in the atmosphere is pushing the object upwards. However when dropping objects at low heights and indoors, like I did, the effects of air resistance are minimal and that is why both the cork and the apple traveled at more or less equal velocities.

	Entry 13: Daniel Sanchez
	Believe it or not, the rainbow-like array of colors shown is real. What you are seeing is all the components of visible light, or the visible spectrum which makes up the colors that the human eye can detect. By placing the cd in a completely dark room, and placing a candle in front of it, you can see this colorful effect. This effect occurs because of refraction, or the bending of light when a wave of energy passes from one medium to another. In this case, the yellowish light from the candle strikes the plastic covering of the cd changing mediums from air to a solid. In this action, the light is refracted and the visible spectrum disperses. Then, the colors from the spectrum hit the mirror-like material on the cd, reflecting all the colors you see. By changing the angle that lights hit the cd, you can change the vibrancy and even the selection of colors on the cd. This unique quality is called Iridescence. Source: http://www.physicsclassroom.com/Class/refrn/u14l4b.cfm

	Entry 14: Ignacio Sanchez
	This photo is of a wine glass half filled with water and on the surface of the water in the glass are little waves. The waves are caused by vibrations from the glass. I ran my finger in circles around the rim of the glass to make the glass vibrate and the vibrations made a frequency. It cannot be heard in the picture but the frequency of the sound being made by the glass can be seen in the water. The more water there is the further separated the waves are and you would be able to tell the difference in wavelength. The further separated the wavelength is the deeper frequency. This shows the physics of frequencies and wavelengths. You can usually only hear the frequency but now it can be seen because of the water.

	Entry 15: Tommy Shott
	In this picture my dog, Smitty, is sitting with a balloon stuck to him rather than floating up to the ceiling. All substances are made up of atoms and these atoms have electrons, which are negatively charged particles. Before this picture was taken, when Smitty and the balloon were separated, both Smitty’s hair and the balloon were neutral; both contained nearly the same amount of positively and negatively charged particles. Then I rubbed the balloon against him. When two materials are rubbed together, electrons are knocked off the atoms in one and stick to the atoms in the other. In this case, the electrons were removed from the atoms of Smitty’s hair and stuck to the atoms of the balloon. The loss of negatively charged electrons caused Smitty’s hair to become positively charged, and the addition of negatively charged electrons caused the balloon to become negatively charged. Unlike charges attract each other, so the negatively charged electrons in the balloon shifted as close to Smitty’s positively charged hair as they could. This attraction caused the balloon to stick to him.