Lab 4 (1)

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Ravyn Solís Lab Partners (Brenna Ashley & Ayi-Lissa Dotson) Physics 1101 Projectile Motion 9/18/22
Purpose Projectile Motion is the motion of an object that has been launched into air upon which the only force acting on it is gravity. If any other force were to act upon the object it would no longer be a projectile. As such, a metal ball is used in this experiment to negate air resistance. The ultimate purpose of this lab is to study the properties of projectile motion. Equipment ● Pasco Capstone Program ● Pasco Time-of-Flight Accessory ● Pasco Universal Interface ● Pasco Mini Launcher ● Pasco Photogate Head ● Pasco Photogate Mounting Bracket ● (2) Metal Ball Bearings ● 4” C-Clamp ● Metric/Inch Engineers Tape Measure ● Carbon Transfer Paper Procedure A Setting up First, plug photogate into digital port 1 and the time-of-flight accessory into Pasco digital port 2 of the Universal Interface. Plug the Universal Interface into the USB port on the computer, then plug the Universal Interface into an outlet. On PASCO Capstone click on Sensor Data. PASCO Capstone will be used to determine time-of-flight. Setting up On the computer there should be a picture of the Universal Interface. Click on Photogate digital port 1 and select Photogate. Click on digital port 2 and select time-of-flight. Setting up Go to Timer set up on the le± side of the screen and do as follows: Timers I. Pre-Configured Timer II. Ensure Ch 1, Photogate and Ch 2, time-of-flight accessory are both checked off III. Time of Flight (1 gate) IV. Check off Time of Flight but NOT Block Event Times V. Opt. 5 should have no parameters VI. Name the gate Time of Flight
The experiment is configured and ready to run. For each of the experiments find Time of Flight (t) to solve for unknowns. Mathematical Solutions Part B - Finding Θ 𝑉? = ?𝑖??𝑎??? / ?𝑖?? ?? ??𝑖?ℎ? 𝑉? = 1. 75 ? / . 01 ? 𝑉? = 175?/? 𝐴??𝑖???? 𝑥 = 1. 75 ? [ True ] Θ = ?𝑖? −1 ( 9. 80 ?/? 2 × 0. 84 ? / 2 × 5 ?/? ) = 55. 41° [ Exp ] Θ = ?𝑖? −1 ( 9. 80 ?/? 2 × 0. 84 ? / 2 × 175 ?/? ) = 1. 35° Percent Error = ( ( | 𝑇??? − 𝐸𝑥? | ) / ( | 𝑇??? | ) ) × 100 Percent Error = ( ( | 55. 41 − 1. 35 | )/ ( | 55. 41 | ) ) × 100 = 97. 56 % Part C - Finding X 𝐴??𝑖???? Θ = 35° [ True ] 𝑥 = 175???(35) = 143. 35 ? [ Exp ] *Due to misunderstandings an assigned x value of 2.00 m was given Percent Error = ( ( | 𝑇??? − 𝐸𝑥? | ) / ( | 𝑇??? | ) ) × 100 Percent Error = ( ( | 143. 35 − 2. 00 | ) / ( | 143. 35 | ) ) × 100 = 98. 60 % Conclusion Projectiles travel with a parabolic trajectory due to the downward force of gravity accelerating an object ( with an otherwise linear trajectory ) down. In this lab, projectile motion could be investigated by determining initial velocity given to a ball and then solving for the range. Possible sources of error include: not measuring the distance when provided , air resistance which is difficult to account for theoretically, and the precision Θ of which the projectile is aimed (as the angle was crudely measured by the given protractor). Despite the percent error being high, this lab has served its purpose in allowing the investigation of projectile motion.
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