Part I: Pendulum Measurements

Carefully level the pendulum's rectangular bob and record the equilibrium position of the straw pointer. Standing close to the pendulum, aim and fire the dart gun so that the dart will strike the middle of the wooden bob. As shown in the picture below, measure and record the amplitude of the straw as it makes it initial swing. You will fire the dart a total of three times, each time recording the amplitude of the pendulum's vibration.

Step 1: Angle data and calculations

Step 2: Mass data, energy and momentum calculations

Using conservation of energy, calculate the velocity, in m/sec, of the pendulum bob and dart immediately after the collision. Remember to show your calculations on your lab sheet. |

Use conservation of momentum to determine the initial horizontal velocity of the dart when first released from the dart gun. Remember to show your calculations on your lab sheet. |

Part II: Projectile Measurements

Carefully level the air gun on the top of a lab table. Test fire it and note where the foam dart strikes the floor and then place a meter stick near the anticipated point of contact. Measure the distance of the end of the gun's muzzle from the edge of the table and use a plumb line to record the location of the edge of the table on the floor. After firing the gun three times, measure and record each of the dart's impact positions. Note that each floor tile measures 12 inches and that there are 2.54 cm to one inch. Remember to always make sure that the gun is level before each firing. Record your answers in the chart below.

What is the average velocity of the air dart when shot from your air gun? Remember to show your calculations on your lab sheet. |

Part III: Percent Difference