Science+Group+4


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

Bing Tian, Yanling Shi
 * 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.) With air resistance, the horizontal distance of the projectile depends on the diameter. The smaller of the diameter, the longer of the distance. without air resistance, no relationship between the diameter and the horizontal distance of the projectile.

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 You will test one variable with and without air resistance.

with(or without) air resistance: protocol: 1. Keep the values of other variables, such as angle, mass, initial speed as constant. 2. select the different values of diameter of the projectile 3 for each of the value of the projectile's diameter, measure the horizontal distance of the projectile. 4 record and analyze the data between the diameter and the horizontal distance. 5 repeat the experiments at least 3 times.

- What are the independent vs. the dependent variables in the experiment? Independent: diameter dependent: horizontal distance.
 * In your experimental protocol you may wish to ask yourself the following:**

- How will you test air resistance in the experiment after testing your initial variable? How do the two variables interact? If the variable is diameter, the horizontal distance would depend on diameter only in case of the presence of air resistance.

- How many repetitions will you need to carry out within the experiment? 3

- What data will you collect and how will you collect it? collected data: horizontal distance. use the ruler to measure the diameter. use the meters to measure the distance.

C. Experimental Protocol:

with(or without) air resistance: protocol: 1. Keep the values of other variables, such as angle, mass, initial speed as constant. 2. select the different values of diameter of the projectile 3 for each of the value of the projectile's diameter, measure the horizontal distance of the projectile. 4 record and analyze the data between the diameter and the horizontal distance. 5 repeat the experiments at least 3 times.

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?

step 1 should follow step 2. choose a certain projectile. step 4 how to anlyze the data. step 5 should follow step 3.
 * Peer Review:**

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.

B. Data should be entered below. Tables for data can be made using the wiki. Simple graphs can be created using MS Office if time allows.

Without air resistance 1st time 2nd time
 * || Height || Range || Time ||
 * d=0.1m || 16.16m || 11.5m || 3.7s ||
 * d=0.3m || 16.16m || 11.5m || 3.7s ||
 * d=0.5m || 16.16m || 11.5m || 3.7s ||


 * || Height || Range || Time ||
 * d=0.1m || 16.16m || 11.5m || 3.7s ||
 * d=0.3m || 16.16m || 11.5m || 3.7s ||
 * d=0.5m || 16.16m || 11.5m || 3.7s ||

3rd time


 * || Height || Range || Time ||
 * d=0.1m || 16.16m || 11.5m || 3.7s ||
 * d=0.3m || 16.16m || 11.5m || 3.7s ||
 * d=0.5m || 16.16m || 11.5m || 3.7s ||

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.