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PHYS1-11_Lab410-07

# PHYS1-11_Lab410-07 - LABORATORY 4 BALLISTIC PENDULUM...

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LABORATORY 4: BALLISTIC PENDULUM Introduction In this experiment you will use the ballistic pendulum to study an inelastic collision. This device is a simplified version of equipment used to measure the muzzle velocity of a rifle. In the rifle experiment, a bullet is fired into a wooden block suspended on ropes. The bullet becomes embedded in the block, and the block swings upward like a pendulum. This is an example of a perfectly inelastic collision : the bullet and block stick together after the collision. The muzzle velocity can be determined by analyzing the subsequent motion of the block and embedded bullet. ************************** SAFETY ISSUES **************************** * * * 1. Wear safety goggles during this experiment. * * 2. Students with long hair should tie it back, so it will not get caught in * * the spring gun. * * 3. Load the gun by pushing on the bullet with your palm, while holding * * the apparatus steady with your other hand. * * 4. Do not fire your gun into the pathway where other students may walk. * * 5. Do not accidentally walk into the path of another group’s firing. * * * * NEVER POINT THE GUN AT ANYONE! * * YOU WILL BE BANISHED FROM THE LAB * * IF YOU THREATEN ANYONE. * * * ************************************************************************* INVESTIGATION 1: Determining the initial velocity of the bullet Equipment The equipment to be used is shown in Fig. 1. A spring-loaded “gun” (#1) fires a steel or brass “bullet” (#2) with an initial velocity . The bullet is trapped by a cup (#3), which is suspended on an arm (#4) to form a pendulum. The cup is initially at rest, but after the collision the pendulum begins to swing upward. A ratchet (#5) at the bottom of the cup is captured at the highest point of swing by the toothed track (#6). o v 1

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