# Part i measuring the launch speed of the projectile v

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Part I: Measuring the Launch Speed of the Projectile vFigure ThreevohoxR1.)Place the launcher on your assigned lab table. Point the launcher toward your group’s assigned "alleyway." Using the hanging weight on the side of the launcher, make sure that the launcher is horizontal.2.)Locate the pointon the barrel of the launcher where the projectile loses contact with the launching mechanism and becomes a projectile. Measure the vertical distance of this point above the floor, ho, and record this value on the data sheet.3.)Prepare the launcher to fire the projectile by using the plunger to push the steel ball all the way down the barrel of the launcher. This “cocks the gun." When the range is clear, fire the gun and pay close attention to where the projectile strikes the floor. Tape carbon paper over a clean sheet of paper on the space where the ball strikes the floor.4.)Without moving the launcher, fire the projectile again. (It is hoped that it strikes the paper!)Repeat this process for a total of five times. Measure the straight line horizontal distance from the launcher to the points where the projectiles struck the floor--the range xR-- and record these values on the data sheet. 5.)Calculate the average range value xR,aveand record this value on the data sheet.6.)Calculate the average initial speed voof the projectile and record this value on the data sheet.o
Part II: Measuring Range Values as a Function of the Launch Angle θFigure FourvohoxRθo7.)Place the launcher on the floor. Point the launcher toward your assigned "alleyway."8.)The launcher needs toon the sideof the vertical face that does not have the overhangMake sure the launcher is on this side and in the set of slots that will allow you to change the angle of the launch without changing the vertical height from which the ball is launched.9.) Tilt the launcher so that it is inclined 5°to the horizontal. Next, measure the vertical height ho, with respect to the floor, of the point on the barrel of the launcher where the projectile loses contact with the launching mechanism. Record this value on the data sheet. (Note:as we increase the tilt of the launcher, we want to keep this vertical distance the same!)10.)Load the launcher and, when it is safe to do so, fire the projectile making sure to carefully note were it strikes the floor. Fix a piece of paper over a piece of carbon paper on the spot noted.Fire the projectile two timesfrom this angle. Measure the range value xRfor each trial and record the value on the data sheet. 11.)Repeat step ten, making sure to keep hoconstant, for the following angles:10°,20°,25°,30°,35°,40°,45°,50°,55°,60°,65°,75°,80°,and 85°Part III: Calculations12.)By now, you should have calculated an average initial speed for your projectile. In this experiment, if we assume the initial speed for the projectile is independent of the angle the launcher o. .