Well balanced?: This tricky balancing act might look improbable, but with a little help from physics you will learn how it works. Image: George Retseck We?ve long understood black holes to be the points at which the universe as we know it comes to an end. Often billions of times more massive than the Sun, they... Read More?? Key Concepts Physics Center of mass Fulcrum Torque Introduction Ever wonder how balancing toys work? Simple toys that entertain by precariously balancing were popular in the Victorian era. These seemingly gravity-defying curiosities can rock back and forth at the edge of a table but remain relatively stable. But how do they balance? The secret lies in a heavy but visually nondescript counterweight attached to the toy. Our eyes are drawn more immediately to the large, ornamental part of the toy that depicts a person or animal rocking back and forth on a tiny pivot point. On its own, this part of the toy looks unstable, which is precisely why such toys continue to be so intriguing?they make little intuitive sense; to an onlooker, it appears that the larger element should send the entire contraption off-balance. For this fun experiment, you won't have to go searching for any century-old antique toys. All you'll need is a hammer, a ruler and a thick rubber band. Background An object's center of mass is a unique point where that object's mass is centered. For simple, symmetrical objects with equally distributed mass (such as a ruler), the center of mass lies in the object's geometric center (which would be just at the six-inch mark for a one-foot ruler). For more irregularly shaped objects?such as a person on a bicycle?you might be more familiar with the term "center of gravity," which refers to a point on an object that's identified by averaging together all the gravitational forces acting on that object. Don't let this confuse you! For our purposes, it's fine to think of these two concepts as the same because Earth's gravity produces a relatively uniform downward pull on small objects near its surface. Think of it this way: If there's more mass in one region of an object than another (say, a person on top of a bike rather than the bike's wheels), then gravity applies more force to that region. Let's apply this concept to two children sitting on opposite ends of a seesaw. They create a simple mechanical system consisting of a lever (the seesaw's plank), a fulcrum (the point about which the plank can tilt) and a couple of weights (the children). If the two children weigh the same, the system's center of mass is located in center of the seesaw's plank and directly above the fulcrum. Put a heavier child on one end of the seesaw, and you've shifted the system's center of mass away from the fulcrum. The greater torque (or force) that gravity applies to the more massive (and thus heavier) side of the system pulls the larger child to the ground while lifting the smaller child into the air. Materials ? Hammer ? 12-inch ruler (plastic works, but wood is preferable) ? Thick rubber band ? String (optional) ? Tape (optional) Procedure ? First, pick up your ruler and balance it lying lengthwise on your index finger. Try using the six-inch mark on your ruler as your balancing point?this is roughly the location of the ruler's center of mass, and you'll notice it's at the middle of the ruler. This is because our ruler is an object of uniform density and is shaped in such a way that it doesn't have a heavier or lighter end. ? Take your ruler and lay it flat on a table or desk. How many inches on the ruler can you nudge over the edge of the table before it falls off? Think about our hypothetical seesaw from earlier. You should find that once you nudge the ruler's center of mass over the table's edge (the fulcrum), gravity applies more torque to the more massive side of the system than the other, dragging it over the edge and onto the floor. ? Now, try to identify the center of mass on your hammer. If you hold your hammer lengthwise, can you balance it by placing your index finger beneath the point of the hammer located halfway along its length? Probably not! In fact, you should find that the hammer's head is much heavier than its handle. We can infer that the hammer's center of mass is located somewhere closer to its head. ? The goal now is to use our materials to build a new mechanical system with a center of mass located as close to the 0-inch tip of the ruler as possible. (Hint: our hammer will act as a counterweight.) Take another look at how classic Victorian balance toys are structured. Knowing what you've learned about where the hammer's center of mass is, where do you think the hammer is going to go when we build our new system? ? Loop your rubber band over your hammer so that it hangs somewhere near the middle. (Depending on how smooth the hammer handle is, you may want to affix the rubber band to the handle with tape. If your rubber band is too stretchy, you can use a loop of string approximately three inches in diameter instead). ? Loop the rubber band over your ruler. This end of the loop should hang near the 2-inch mark on the ruler. The end of the hammer's handle should intersect and form an acute angle with the ruler at around the 8-inch mark. ? Place the end of the ruler that starts with zero near the edge of the table. Does it balance? Try altering the position of the hammer's head relative to the tip of the ruler. With some careful adjustments, you can tweak the system so that its center of mass is located at the very tip of the ruler. ? Once you've gotten your system to balance, try nudging the 0-inch end of the ruler closer and closer to edge of the table. By doing so, you're moving the system's center of mass progressively closer to the fulcrum and, if you're careful, you can produce a dramatic effect by getting your system to balance on a mere sliver of the table's edge. ? Extra: If you want to create an even cooler visual effect and make your system look more like a Victorian balance toy, place a very light stuffed animal on the 12-inch end of the ruler. (A stuffed monkey that hangs onto the end of the ruler with clasped Velcro hands is a crowd favorite.) Source: http://rss.sciam.com/~r/sciam/basic-science/~3/_1MKF115yk0/article.cfm extenze tenacious d steve smith zou bisou bisou tim tebow press conference tebow press conference trina

Brand: 山田工業所Color: black (black 19-3911tcx)Features: Inner Dimensions: 11.8 inches (30Depth: 3.5 inches (90 mm)Product Weight: 1040gMaterial: Iron, woodYamada Kogyo wok is made by a hammer (machine) for thousands of times using a "hammer" methodDetails: Description Yamada Kogyo wok is made by a hammer (machine) for thousands of times using a "hammer" method. [Hammering] is a manufacturing method that allows the pot to be turned by hand and using a special machine with a hammer after pressing a single flat sheet of steel sheet and then rearrange the pot shape by hand. Because each product is handmade by a hammered method, each product has fine scratches, welding marks, and scuffs. Due to the production process, the surface of the product may appear like scratches at first. In addition, due to high heat treatment when welding the handle parts, color difference and black leather peeling may occur, but this does not affect the quality of the product, so please rest assured that you can use it.Package Dimensions: 100x485x980

Inner dimensions: 36cm Depth: 110mm Weight: 1370g Material: Iron/Wood Yamada Kogyo's woks are made using a process called [hammering], where each wok is struck thousands of times with a hammer (machine). [Decouching] is a manufacturing method in which a flat iron plate is pressed and then hammered over and over again with a special machine equipped with a hammer, turning the pot by hand to shape it into the shape of a pot. Because each item is handmade using the stamping method, each item may have small scratches, welding marks, and scratches. Due to the production process, production marks may remain on the surface of the product, which may appear like scratches at first. Also, since the handle part is welded under high heat, there may be differences in color and peeling of black skin, but there is no problem with quality, so please use with confidence. ●Products for commercial use for restaurants Color: ‎BlackSize: ‎36cmManufacturer: ‎Yamada IndustriesMaterial: ‎IronProduct weight: ‎2.87 lbsDiameter: ‎36 cmWater-repellent finish: ‎EmbossedDishwasher safe: ‎NoPacking weight: ‎2.87 lbsUses batteries: ‎NoBattery included: No

Product Description Brand: Yamada Color: Black Features: Size:300x90mm Product Weight: Approx. 32.8 oz (980 Material: Iron Country of Origin: Japan / Yokohama Due to the manufacturing process, there may be slight differences in size, depth, and weight than size As it is handmade, there may be minor scratches, peeling of black leather or uneven colors on the surface, but this is not a problem with the quality of the product Instruction manual not included, please read product description Since there is a rust prevention varnish, please make sure to take an empty baking process after arrival Details: Description Yamada Kogyo wok is made by a hammer (machine) for thousands of times using a “hammer” method. [Hammering] is a manufacturing method that allows the pot to be turned by hand and using a special machine with a hammer after pressing a single flat sheet of steel sheet and then rearrange the pot shape by hand. Because each product is handmade by a hammered method, each product has fine scratches, welding marks, and scuffs. Due to the production process, the surface of the product may appear like scratches at first. In addition, due to high heat treatment when welding the handle parts, color difference and black leather peeling may occur, but this does not affect the quality of the product, so please rest assured that you can use it. Package Dimensions: 116x450x970 UPC: 699234367487 Department: Home Tags: Black Home Yamada

Professional 8in1 unoisetion cavitation 2.0 machine with RF radio frequency facial vacuum body slimming face lifting treatment, is an advanced non-surgical solution for skin tightening wrinkle removal body contouring cellulite treatment weight loss.

Physical treatment and ultrasonic vibration, no side effect, safe and assured to use.   Using hot and cold alternately, can activate cells thoroughly, improve overall skin texture, skin tightening, facial lifting, pore shrinking, and eliminating eye bags and dark circles.   Working time and temperature can be displayed on the screen separately according to the modes you choose.   Easy to operate and convenient for daily skin care.   Slight vibration massage offers a comfortable feeling when moving slowly on the face under the hot mode.   Ventilation design helps the heat distribution and avoid burning.   Function: 1.Cold Treatment(5-25°C/ 41℉-77℉ ):  ① Shrink blood vessel pores, improve coarse pores;  ② Reinforce collagenous fiber, make your skin became elastic, fade wrinkles.  ③ Effectively reduce varicose veins, hazardous wastes are more likely to be purged, can help to fade and eliminate dark spots  ④ To reduce nerve sensitivity, reduce the redness and swelling pain of the skin, especially for the sensitive skin.  2.Hot Treatment(30-55°C/ 86℉-131℉ ):  ① Relax muscle, relieve pain and soreness;  ② Promote blood circulation and helps to better absorb skin care products;  ③ Improve skin metabolism ,discharge waste toxins, help to fade eye pouch and dark circle.  Note: Clean skin before using the instrument, and then use appropriate nutrient cream to achieve better results  It is forbidden to switch the instrument frequently to avoid damage to the device caused by current impact  The instrument switch should be turned off after use, and the power plug should be pulled out to prohibit the instrument from being energized for a long tine  Place it in a place that children cannot touch  Please read the instructions before use.

We have big changes coming up this Summer both personally and professionally as Matt and I will be moving – and, by default, our in-home Thread Theory studio will also be changing locations! …

https://www.youtube.com/watch?v=tWVCT1uMVT8&feature=youtu.beDesigner Michael David Young calls the Auto Hammer his "mad scientist project" but we're pretty

You could argue that the hammer is the original multi-tool. But Craftsman’s Flex Claw Hammer takes it a step further by adding a fully adjustable 4-position pry bar to the nail pull side of the hammer. It also features a dual-sided grip and magnetic nail starter on the strike face to keep your fingers out

You don't see too much stuff on etsy that is just classic, such as this wooden toy/jelly bean dispenser by Stump Pond Woodworks. I seriously want to buy one of these and bring it to work so I can watch our customers get all excited when they watch the jelly beans fall down its wooden slides. It's much more fun that our current candy offering of peppermints (we actually get reprimanded for the mints since we used to always have something Hershey's). Jelly Beans certainly aren't the greatest candy, but what presentation! I guess you could stick tic tacs in there but tic tacs are kind of gross. This one is called Wilbur Woodpecker, and I had one of these as a kid, except it was a more girly bunny rabbit. Here you drag the little bird to the top of the pole and let go and then he shimmies down, giving the illusion that he's pecking the pole. Cute and simple, it's a timeless toy that every child should have, and should bring a nostalgic smile to every parent's face. I don't know about this one - a Flipshooter. Looks like a fun thing to watch your friends play after they've had a few drinks. Their description: "Shoot the ball into one cup and flip it back to the original cup. How many times can you do it ??? Similar to a toy found in a Chinese child’s tomb and estimated to be 2500 years old. Suitable for 4 year olds and up." Maybe I need one of these, too... Maybe it's my childhood spent in the country with my grandparents, where there was nothing to do but watch Lawrence Welk or play with hot wheels in the dirt but it doesn't get much better than classic wooden toys like these!