https://www.geogebra.org/m/ht8d7zfv
Lilli 4: A Ballistic Pmy'wtile Physics 203: Profs. Walters' & Martens Yaverbaum, John Jay College of Criminal Justice. the CUNY Necessary Eguigment: l. A Simulated Standard Ballistic Pendulum Apparatus & Ball (e.g., Geogebra) 2. A Simulated Standard Photogate & Digital Timer (e.g., Geogebra) 3. A Simulated Medium-Size Paper & Wax-Coated Cup [TM 2:. \"v: 1. 2. 5" To apply the principles underlying projectile motion so as to make a veriable retrmlictioni To probe the connection between Galileo's Principle of Relativity (esp. \"Form 4") and the principles underlying projectile motion. To use the laws of physics in a vivid forensic investigation. To not get hurt, by the awesomeness ofthis simulation. Immediate Obl'ectives: l. 2. To determine where a "weapon" (ballistic pendulum) must have been located ifa "bullet" (brass sphere) hit a particular target. D Specifically, to use analysis and computations (rather than trial and error) to determine where you must place your ballistic pendulum so that it successfully res a brass sphere into a cup. To not get hurt, by the awesomeness ofyour retrodictive powers. What is known: 1. 2. 3. _Ax = T i 2 Axes are independent: movement in the y direction does not affect movement in the x direction (from Galileo's Principle ofRelativity). Gravity exerts a constant acceleration on all objects in free-fall, regardless of their initial velocity (discovered in lab 2). This constant acceleration, abbreviated g, is approximately 9.8 m/s2 (canonical). . 2 Under constant acceleration, Ax : at + 1706. What is not known: Everything else. Procedures: Part I- The Determining I. The Simulation A. Unlike the real world this simulation can be put into full screen and be reverted back to its original conguration. B. The symbol on the bottom right-hand side can be used to display the simulation in full screen. C. The symbol on the top righthand side can be used to revert the simulation to its original conguration. This can be helpful ii'you happen to skew the view making it hard/impossible to continue the experiment. I]. The Ballistic Pendulum. A. Observe your ballistic pendulum. Yours is one model ofa classic piece of equipment--ultimately intended as a means for determining the speed of a tired bullet. We will return to its classic use later on in the course-during our investigation ofenergy and linear momentum conservation. Right now, we are using it as, simply put, a gun. More specically, we are using the ballistic pendulum as a means for ensuring a reproducible and purely horizontal initial velocity. As you can see, this device has the potential to do real simulated damage-both to simulated inanimate and to simulated animate objects. We ask you to be cautious and responsible when using this simulation. [11. The Photogate. A. The photogate, when connected to an appropriate output, provides the means for obtaining high-precision timings. The photogate uses an infrared beam that is part of an electrical circuit. When you press the manual switch, a timer begins counting. When the beam is broken by a passing object, the circuit is broken and the time is recorded. The virtual Photogate simulates the real version. Ifthe ball Does Not go through the photogate, then No Time will be displayed. B. You can move the photogates around by clicking and holding them and moving them around the screen. Once the ball has been red they will lock in place. Press Return to return the ball and unlock the photogates
