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Magic Spoon
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===Full Explanation=== Many of us have heard of "magic" items like this before. Often these items are bracelets or charms that supposedly help with balance and strength, but in actuality don't affect you in any way. Rather, the salesman is using sleight of hand and clever tricks to hide the truth. In reality, they are using torque to make the illusion of "magical" properties with the object. ''Torque'' is a rotational force, or when you have a force applied to an object while it rotates on an axis: {| class="wikitable" style="color:black; background-color:#ddd; text-align: left; margin-right: 20; float:left" |+ Torque |'''Ο''' = '''r''' '''''F''''' sin '''ΞΈ''' |- | '''Ο''': Torque |- | '''r''': Radius from axis |- | '''''F''''': Force applied, where '''''F''''' = m''a'' |} When you apply a force to an object on an axis, the distance you are from the axis is inversely related to the amount of force you have to apply. An easy way to think of this is by thinking about a door; If you push on the door while close to the hinges, you have to apply more force. Likewise, if you push on the door where the doorknob is, which is far from the hinge, you have to apply less force. In this demonstration, we are taking advantage of torque to make it seem like the "Magic Spoon" works. When the presenter pushes down on the volunteers arm(s), they are making sure to stay aware of ''where'' they are applying the force. The volunteer's shoulder is the point of rotation, and so the radius from the axis can be determined by where on the volunteer's arm the presenter pushes down. If the presenter is holding the spoon, they will push down on the forearm, which is far from the shoulder and requires less force to be applied to it. If the volunteer is holding the spoon, the presenter will push down on the upper arm, which is close to the shoulder and requires more force to be applied to it. If the presenter feels like being extra sneaky about this, they can take this demonstration one step further, and switch positions with the volunteer. In this case, by carefully positioning themselves in regard to the volunteer, the presenter can get the same effects to happen without the volunteer catching on!
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