Projectile Motion Lab. Starter: A marble is fired from the table to the floor. If an overhead light is on, what can you say about the velocity of the shadow? Does it speed up or slow down during the flight?. Part A: Horizontal Shot to find v i.
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Starter: A marble is fired from the table to the floor. If an overhead
light is on, what can you say about the velocity of the shadow?
Does it speed up or slow down during the flight?
Part A. Horizontal Shot ( q = 0 ) Given R, h, and q=0 , findvi and t.
Using (1) yf = yi +viyt + gt2 and (2) xf = xi +vixt
and also vix = vicosq = vi and viy = visinq =0, then (1)
(3) 0 = h - gt2 and (2) becomes:
(4) R = vit which yields:
(5) t = and (6) vi = R
Part B. The trajectory equation for the shot marble is :
The predicted range is found by solving this equation for R.
This is a quadratic equation. The computer will solve this equation
for you when you tell it your height h, initial velocity vi, and projection angle q.
Part A. Determine the Initial Velocity of the Launcher.
1. Open the excel file “ Projectile Motion Lab Workbook.”
You will enter your measurements in this workbook.
The work book will calculate the initial velocity of the launcher
and the predicted ranges based on that velocity and your height.
2. Set the launcher to fire horizontally. Measure the height from the floor
to the marble before its launched and enter this in the workbook.
3. Make a horizontal shot three times and measure the range. Enter the
three measurements in workbook . The initial velocity will be calculated
vi = R
Part B. Angle Shots
Fire the launcher and measure the range for the angles of 15 degrees
to 60 degrees in 5 degree increments. Enter the range measurements in the
excel workbook “ Projectile Motion Lab Workbook.” The theoretical
range will also be calculated by the workbook.
All questions must be written in your report and answered
in complete sentences. Take time and care to explain your
How well did your measured ranges compare to the predicted ranges?
Comment on the fit. Look at the graph for information.
At what angle was the range greatest? Least?
What would happen to the range of the horizontal shot
if you fired from a higher location?
Excel print out.