Science+Group+2

Maggie, Jenny, Shirley
 * Names of Experiment Designers** (those that design the experiment):
 * 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.)

Without air resistance, as the speed increases, then the range and height will increase; but time will decrease ; while if considering air resistance,as the speed increase then the range and height will increase as well, but time will decrease.

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.

- What are the independent vs. the dependent variables in the experiment? - How will you test air resistance in the experiment after testing your initial variable? How do the two variables interact? - How many repetitions will you need to carry out within the experiment? - What data will you collect nd how will you collect it?
 * In your experimental protocol you may wish to ask yourself the following:**

C. Experimental Protocol:

without air resistance independent: initial speed, mass, angle and diameter dependent: range, height and time

we will choose the same objects in all experiments. the mass angle and diameter should be same in all experiments. we will change initial speed as 18m/s; 25m/s and 30m/s and then we will compare the results of range, height and time

we will repeat the experiment at least 3 times. and work out the average value. we will collect the data of range, height and time through the website. with air resistance independent: initial speed, mass, angle and diameter dependent: range, height and time

we will choose the same objects in all experiments. the mass angle and diameter should be same in all experiments. we will change initial speed as 18m/s; 25m/s and 30m/s and then we will compare the results of range, height and time

we will repeat the experiment at least 3 times. and work out the average value. we will collect the data of range, height and time through the website.

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? Yes. but not clearly stated.

- Is the protocol easy to follow? Is it sequential? Not very clear. The sequential is OK.

- Can the independent and dependent variables be easily identified and measured? No.

1. The hypothesis doesn't show any difference between two sets of experiments. 2. Mass and diameter are contants. 3. Three readings are not enough for each set of experiment. 4. How the interdependence three parameters will be displayed graphically?
 * Peer Review:**

B. The experimental designers should now alter the experimental protocol based upon peer review. 1. Two parameters should be investigated each time instead of being studied simutaneously. 2. At least 5 readings should be taken for each set of experiment.

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: angle (degrees):80, mass(kg):2, diamter(m):0.1 with air resistance: angle (degrees):80, mass(kg):2, diamter(m):0.1
 * Speed (m/s) ||  Range(m)  ||  Height(m)  ||  Time(s)  ||
 * 18 ||  11.5  ||  -1.2  ||  3.7  ||
 * 25 ||  22  ||  -1.2  ||  5.1  ||
 * 30 ||  31.6  ||  -1.2  ||  6.1  ||
 * Speed (m/s) ||  Range(m)  ||  Height(m)  ||  Time(s)  ||
 * 18 ||  10.6  ||  -1.2  ||  3.6  ||
 * 25 ||  19.1  ||  -1.2  ||  4.8  ||
 * 30 ||  25.9  ||  -1.2  ||  5.7  ||

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.