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Projectile Motion Lab: Predicting Impact Point, Lab Reports of Physics

Sioux Falls SeminaryPhysics

It is the moving of an object which is projected into the air, subject to only the acceleration of gravity

Typology: Lab Reports

2020/2021

Uploaded on 05/12/2021

ekavaria
ekavaria 🇺🇸

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(38)

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Projectile Motion Lab
Introduction
Projectile motion is a path traveled by an object influenced by the initial
velocity, launch angle, and the acceleration due to gravity. In this
experiment you will predict the spot a steel ball will land after being
launched.
Objectives
In this experiment, you will
● Measure the initial velocity of a steel ball using a Vernier Projectile
Launcher.
● You will apply the ideas from two-dimensional kinematics to predict
the impact of a ball in projectile motion.
● Don’t forget to take into account the different trial variations in the
speed measurements when calculating point of impact.
Materials
1. Computer
2. Vernier Projectile Launcher
3. Vernier lab quest
4. Small cardboard box
5. Steel ball
6. Meter stick
7. Waxed paper
Initial Set Up
1. Position the launcher next to the edge of your table. Eventually you
will fire a ball horizontally that will travel several meters, so plan for
this when choosing a location.
2. Use the lower knob on the back of the unit to adjust the position of
the launch chamber until level. Then tighten the knob to maintain this
position.
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Projectile Motion Lab

Introduction Projectile motion is a path traveled by an object influenced by the initial velocity, launch angle, and the acceleration due to gravity. In this experiment you will predict the spot a steel ball will land after being launched. Objectives In this experiment, you will ● Measure the initial velocity of a steel ball using a Vernier Projectile Launcher. ● You will apply the ideas from two-dimensional kinematics to predict the impact of a ball in projectile motion. ● Don’t forget to take into account the different trial variations in the speed measurements when calculating point of impact. Materials

  1. Computer
  2. Vernier Projectile Launcher
  3. Vernier lab quest
  4. Small cardboard box
  5. Steel ball
  6. Meter stick
  7. Waxed paper Initial Set Up
  8. Position the launcher next to the edge of your table. Eventually you will fire a ball horizontally that will travel several meters, so plan for this when choosing a location.
  9. Use the lower knob on the back of the unit to adjust the position of the launch chamber until level. Then tighten the knob to maintain this position.
  1. Next, use the upper knob on the back of the launcher to set the scale to 0 degrees. Move the scale so the notch of the launcher chamber is at 0 degrees. This setting accounts for deviation of the tabletop from horizontal.
  2. Connect the projectile launcher to the labquest.
  3. Connect the hand pump to the projectile launcher. Set the release pressure by adjusting the range knob. Turn the knob clockwise for higher pressure and higher launch speed. Turn the knob counter- clockwise for lower pressure and lower launch speed.
  4. Remember to select a release pressure that is appropriate. Keep pumping the pump until you hear at least three small release sounds, then wait for the pressure to stabilize which should be about five seconds. Also do not change the release pressure for the rest of the lab or your prediction will be incorrect. Procedure
  5. First insert the steel ball into the launch chamber with your index finger and push the ball into the barrel.
  6. Pump the hand pump until it reaches your selected pressure. Now keep pumping until you hear the three small release sounds. Wait five seconds for the pressure to stabilize.
  7. Collect data using the following steps: a. Click the “collect” button to start data collection. b. Hold the cardboard box so you can catch the ball right after it leaves the projectile launcher. Do not let the ball hit the floor. This is important. c. When you want to launch the ball, press and hold the arm button, and then press the launch button. d. Record the speed in the data table.
  8. Repeat this process, catching the ball with the cardboard box until you complete a total of 10 launch speed measurements. Record the values of the speed in Table 1.
  9. Review your speed data of each trial and calculate the average speed values and identify the maximum and minimum values. Record those values in Table 2.

Data Table Table 1 trial Speed (m/s) 1 2 3 4 5 6 7 8 9 10 Table 2 Maximum speed m/s Minimum speed m/s Average speed m/s Table height, h m Table offset, x₀ m

Table 3 Predicted range (m) Predicted floor distance (m) Average speed Maximum speed Minimum speed Table 4 Floor distance (m) Range (m) Actual impact Analysis Questions

  1. Would you expect any value prediction based on experimental measurements to be exact numbers? explain.
  2. Was your impact point between your maximum and maximum impact predictions? Was your prediction successful or not?
  3. You accounted for variations in the speed measurement in your range prediction. Are there other measurements you used which affect the range predictions? What are they?
  4. Did you account for air resistance in your prediction? How or how not?