Problem:

What is the relationship between a projectile’s size and its range?

Introduction:

Consider an object that is shot horizontally with a velocity of 200 m/s. Neglecting air resistance, the object will travel 200 m horizontally each second. However, immediately after being projected, the object also feels the inevitable force of gravity pulling it down toward the earth. Accelerating downward at a rate of 9.80 m/s2, the object continues to travel forward and according to the Law of inertia, it moves at constant speed. The trajectory, a combination of the object’s inertia and the pull of gravity, becomes curved.


Instructions:

  1. Each person in your lab group must read every page in this online procedure. Along the way, there will be questions that you must answer.
  2. Designate one person in your group as the Data Recorder. This person should open the Google document Experiment 9 - Horizontal Projectile Motion for the approved answer template.
  3. When this Google document opens, sign in to your Google account.
  4. From theFILE Menu, chooseMake a copy...
  5. From theFILE Menu, chooseRename...and rename the document as follows: Exp 9 - Period (1, 3, 6, or 8) - Group #.
  6. Share this document with the members of your group and with Mr. Skubis at HSTScience@gmail.com.
  7. As a group, answer all questions. Remember to use complete sentences and be mindful of grammar, spelling, and punctuation.
  8. REMEMBER: **Plagiarism** is a form of **Academic Dishonesty** which carries harsh consequences. DO YOUR OWN WORK!

Procedure:

  1. Attach a projectile ramp to the edge of the table with a c-clamp.
  2. Obtain a projectile and allow it to roll down the ramp to the floor a few times to get an approximate idea of its range.
  3. Make a target with a piece of blank paper and a piece of carbon paper. Secure the blank sheet to the floor with a small strip of masking tape. Place the carbon paper on top of this sheet with the ink side down.
  4. Allow the projectile to roll down the ramp and hit the target 10 times.
  5. Remove the carbon paper and draw a tight circle around the marks.
  6. Without moving the paper target, measure the distance between the center of the circle and the edge of the ramp. Record this as the range.
  7. Measure the distance vertically between the floor and the top of the ramp. Record this as the table height.
  8. Make all appropriate calculations.
  9. Repeat the above steps for two different projectiles.
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Analysis/Calculations (Show 3 sig figs.)

  1. Calculate the time of the fall.
  2. Determine the initial horizontal velocity of each projectile.
  3. Now determine the vertical velocity final and the velocity total upon impact.