Plotting the displacement of the bow string as successive 1 kg weights are added shows the force constant of the bow to be about 500 N/m.Īs an example, pulling the bow string back 12.23 cm should propel the 87.57-gram arrow about 4.217 m high to just barely touch the ceiling. The arrow is released when the trigger is touched. Having performed all the necessary measurements to determine the arrow's mass, the force constant of the bow, and the height one would like to shoot the arrow (all of which can be done before class if time is an issue), attach the trigger-release to the bow string and pull it back the calculated distance. Once its location has been decided upon, one needs to measure (using the HiJacker) the distance from the tip of the arrow to the ceiling. The mount may be attached to one of our demo carts or to the lecture bench. The bow then gets clamped into a special mount made for this experiment. Use the "bow stringer" to string the bow (a 35# recurve York Crest bow of 64" length) with the 60" bowstring. Alternatively, it's equal to the area under the curve. Knowing the force constant, one can then calculate how much work is done when the bow string is pulled a certain displacement. The most important member of the five bows is the body bow. Without knowing how the bows operate, one can never shoot out an arrow successfully, not to say with power. However, very few know exactly how the bows operate. The Hou Yi, however, is one of the few mortals who helps the gods, thanks to his great skill with the bow and arrow. It is a linear relationship for reasonable displacements and the bow's stiffness, or force constant, can be deduced from the slope of the line. It is said that 'Fa Jing' is like shooting out an arrow. The legend of Hou Yi Shooting the Sun (Hou Yi She Ri): In many ancient Chinese myths, as well as the myths of other cultures, the gods help the people. Not working with a controller (For lack of a controller to test with. The bow looks different to other players when it is drawn (A fix was attempted but with only one instance of the game running, for lack of RAM)). The graph shows displacement as a function of force. Glitched in multiplayer (Arrows are more lethal because of a game limitation (This could be worked around). Measuring the displacement of the bow string as more weights are added shows that the bow obeys Hooke's Law. With the bow pointing up and secured to a cart as pictured, weights are hung from the bow string. How it works:įor safety purposes, the arrow has a tennis ball glued to its tip. Using conservation of energy, one can calculate how far the bow string must be pulled back in order for the arrow to reach a certain height (specifically, for the arrow to just touch the ceiling of the lecture hall). When the arrow reaches the top of its flight, it has zero kinetic energy and the initial elastic potential energy is now gravitational potential energy of the arrow. Licenses & Certifications Presenting to Senior. When the string of a bow and arrow is pulled from equilibrium, the elastic potential energy in the bow is converted to kinetic energy of the arrow when the string is released. Experience Department Manager ASML Feb 2022 - Present1 year 4 months San Diego, California, United States Design electronics modules for EUV system. Use conservation of energy to predict the height the arrow will reach.
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