Group+1+-


 * Names of Experiment Designers ** (those that design the experiment):

Ashlee Tetreault Amber Teeters
 * Names of the Peer Reviewers ** (collaborating group):


 * Names of the Investigators ** (those that will conduct the experiment):

Part 1. Design of a projectile motion experiment
A. What is your hypothesis? (You will test one variable with and without air resistance.) As the angle increases the distance of the cannon increases.

B. Create a step by step experimental protocol to test your hypothesis using the applet at: http://phet.colorado.edu/sims/projectile-motion/projectile-motion_en.html 1. Choose an item to launch (except for user choice) 2. Choose initial speed between 20 and 40 m/s. Do not change your speed once you select it 3. Fire your cannon at the angle indicated and complete the table below by measuring your distance with the on screen tape measure.

Without Air Resistance
 * Angle || Distance ||
 * 0 || 9.9 ||
 * 5 || 14.0 ||
 * 10 || 19.0 ||
 * 15 || 24.2 ||
 * 20 || 29.2 ||
 * 25 || 33.7 ||
 * 30 || 37.3 ||
 * 35 || 40 ||
 * 40 || 41.6 ||
 * 45 || 42.6 ||
 * 50 || 41.2 ||
 * 55 || 39.2 ||
 * 60 || 36 ||
 * 65 || 31.8 ||
 * 70 || 26.7 ||
 * 75 || 20.7 ||
 * 80 || 14.2 ||
 * 85 || 7.2 ||
 * 90 || 0 ||

With Air Resistance 4. Is your hypothesis supported by the data? If not what needs to change about the hypothesis? It is supported up to 45 degrees but beyond this it is incorrect as shot distance begins to decrease with increased angle. - What are the independent vs. the dependent variables in the experiment? Independent variable is the angle of the cannon and the distance is the dependent variable. - How will you test air resistance in the experiment after testing your initial variable? How do the two variables interact? Repeat the experiment including air resistance and compare the results of the two experiments - How many repetitions will you need to carry out within the experiment? Twenty for each experiment - What data will you collect and how will you collect it? Distance of the projectile using the on screen tape measure in both experiments.
 * Angle || Distance ||
 * 0 || 9.9 ||
 * 5 || 14.0 ||
 * 10 || 19 ||
 * 15 || 24.2 ||
 * 20 || 29.2 ||
 * 25 || 33.7 ||
 * 30 || 37.3 ||
 * 35 || 40 ||
 * 40 || 41.6 ||
 * 45 || 42 ||
 * 50 || 41.2 ||
 * 55 || 39.2 ||
 * 60 || 36 ||
 * 65 || 31.8 ||
 * 70 || 26.7 ||
 * 75 || 20.71 ||
 * 80 || 14.2 ||
 * 85 || 7.2 ||
 * 90 || 0 ||
 * In your experimental protocol you may wish to ask yourself the following: **

C. Experimental Protocol:

Part 2. Peer review of experimental protocol.
A. The peer review group should enter their comments regarding the experimental protocol below. They should ask themselves: - Is the hypothesis being careful tested? - Is the protocol easy to follow? Is it sequential? - Can the independent and dependent variables be easily identified and measured?


 * Peer Review: **

We suggest to change the range in hypothesis to match the table to say distance. Protocol was easy to follow and went in order. Independent and dependent variable can be identified.

B. The experimental designers should now alter the experimental protocol based upon peer review.

Part 3. Conduct the experiment.
Now a different group will conduct the actual experiment using: @http://phet.colorado.edu/sims/projectile-motion/projectile-motion_en.html

A. The investigational group should try to follow the protocol as written. Changes can be made if the protocol is not clear. No need to do it twice with air resistance as this only affects the launch with a change of diameter.

B. Data should be entered below. Tables for data can be made using the wiki. Simple graphs can be created in MS Office if time allows. Without Air Resistance
 * Angle || Distance ||
 * 0 || 9.9 ||
 * 5 || 14.0 ||
 * 10 || 19.0 ||
 * 15 || 24.2 ||
 * 20 || 29.2 ||
 * 25 || 33.7 ||
 * 30 || 37.3 ||
 * 35 || 40 ||
 * 40 || 41.6 ||
 * 45 || 42.6 ||
 * 50 || 41.2 ||
 * 55 || 39.2 ||
 * 60 || 36 ||
 * 65 || 31.8 ||
 * 70 || 26.7 ||
 * 75 || 20.7 ||
 * 80 || 14.2 ||
 * 85 || 7.2 ||
 * 90 || 0 ||

Without air resistance



Part 4. Results and Discussion
The investigational group should now write a short paragraph using scientific writing to explain their findings. Findings will be discussed with the group at large.

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