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Projectile Motion Lab

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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)

becomes:

(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

using:

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

answers carefully.

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?

Coversheet

Excel print out.

Questions.

Summary.