Activity B Vertical Firing Procedure A General Procedure In This Section You Will Use The Same Gun And Range Settin 1 (119.35 KiB) Viewed 24 times
Activity B - VERTICAL FIRING PROCEDURE A. General Procedure - In this section you will use the SAME gun and range setting that you used for the horizontal firing. This time you will fire the gun straight up. You will use the average maximum height reached by the ball to calculate the initial speed of the ball. B. Detailed Procedure 1. Turn the gun until it is pointed straight up. Prop a two-meter stick up next the gun. The stick should be oriented vertically, with the zero mark touching the floor. 2. Three people are required to take the data: one to fire the gun, one to observe the highest point reached, and one to catch the ball. Fire the gun several times to practice coordinating your efforts. If you are the observer, you can either estimate the maximum height by eye or by taking a video with your phone. Use the top of the ball as a reference point. Fire the gun, then observe and record the maximum height the top of the ball reaches. Repeat for a total of 12 runs. Record your data in the table on the next page. 3. Look at the physical setup and at the figure on page B-3 then answer all of the following questions for the vertical firing. a. Is the gun cocked or un-cocked when the ball becomes a projectile? b. When measuring the initial and final heights of the ball, should the reference point on the ball be the top, bottom, or middle? c. What is the acceleration of the ball after it leaves the gun? Neglect air resistance. Put in a numerical value. Vertical Firing Analysis - Each person must do all of the following steps. Work independently and compare numbers to eliminate mistakes. 1. Complete the table below by doing the following: a. Calculate the mean (average) distance for the 10 firings. b. Calculate the deviation of each run from the mean. Note that the deviation is the distance 41.. £414 Lab 3: V vs T ▼ Lab 4: Vectors -------- Lab 5: Newton's Laws 1 0 m/s² Lab 6: Newton's L
Run Number Maximum height reached, y (cm) Net vertical displacement h-y-yo (cm) Deviation Ah-hi-hav (cm) Deviation squared (Ah)² (cm²) 1. Complete the table below by doing the following: a. Calculate the mean (average) distance for the 10 firings. b. Calculate the deviation of each run from the mean. Note that the deviation is the distance for that run minus the mean distance. Deviation can be positive or negative. c. Calculate the mean (average) of the deviations. d. Ideally, what should the mean of the deviations equal? Put your answer here e. Square each deviation. f. Calculate the mean of the squared deviations. Gun ID Number 1 Initial height of the ball (yo): 1 224.4 2 Lab 3: V vs T ▾ 128.5 cm 225.2 3 Lab 4: Vectors ▾ 230.1 4 228.3 Put in your units 2. Calculate the standard deviation o in the space below. Show units with your numbers. 5 Lab 5: Newton's Laws 1 ▼ 226.3 6 228.1 Lab 6: Newton's Laws 2 - 7 229.9 8 224.1 Lab 7: Projectiles ▼ 9 227.2 10 Lab 9: Energy 1 ▾ 226.3 11 ◄ ▶ 225.1 12 229.1 Mean
4. You are going to use the kinematic equation vy² = voy² - 2g(y-yo) to find the initial speed of the ball. Note that vy=0 when the projectile reaches its maximum height. a. Show on the figure to the right the path of the projectile and coordinate axes that you will use. The origin position is important. Please do your work in pencil. b. Use the mean net vertical displacement (y-y0) of the ball and apply the equation to find the initial vertical speed (v0y) of the ball (when it becomes a projectile - leaves the gun). Show all of your work in the space below: equation used, algebra, numbers and units. Please do your work in pencil. 5. Calculate the percent difference between the launch speed calculated from the horizontal firing procedure (step 4 of part A) and the launch speed calculated from the vertical firing procedure (step 4 of part B) Percent Difference = (V₁ - V)/(Va) *100% Vay = (V₁ + V₂)/2
Join a community of subject matter experts. Register for FREE to view solutions, replies, and use search function. Request answer by replying!