Bow+and+Arrow

Group Members: Grace Kohn, Mickey Mulder, Nick Sather, Amaya Bayne

Research Question: What is the angle to at which, when launched, with all other variables kept constant, an object will fly the greatest distance?

Research assigned for 10/3: MickeyMulder- Find theoretical angle (completed) Grace Kohn- Find bow mechanics information to find equations (completed) Nick Sather- Draw setup of sling shot and note possible error (completed) Amaya Bayne- Get the bow and arrow and make sure they are in working condition

Launching a projectile at 45 degrees from the ground will allow it to reach it's optimum distance (in the x axis).

This is because the initial velocity is evenly distributed between the x and y directions. Giving the projectile the most air time with the highest horizontal velocity.

The above is true for a projectile launched in a vacuum so that there are no drag forces. The drag forces depend upon both mass and shape. "Because the horizontal component of a projectile's velocity decreases steadily as it moves through the air, its path is not symmetric about its highest point. .... in real life --the maximum range occurs for an initial angle of less than 45o. The greater the drag force, the lower the angle for Rmax (maximum range). For a baseball struck hard by a bat, the optimum angle is about 40o." [Beiser, A. //Physics, 5th edition, p52//]

Here's a good website that has a powerpoint that talks about the physics of archery and the mechanics of a bow and arrow: http://dvworld.northwestern.edu/class/mechanics/330presentations/ellen_olgagopan_archery/Presentation.ppt#3 The main physics points that we need to know are work, kinetic energy, and potential energy.

Some new stuff Nick and Mickey and kinda Amaya worked on- if we attach two of McNeills protractor-ramp things together we can reach an even 90 degrees, launching a marble or small steel ball will be easy than a arrow, we need a person down plain (I guess that means wear a hard hat) We have finally come to a conclusive setup, its hard to explain on here, but it works as a sling shot

Finally are slingshot is complete and partly pink thanks to stevo: pics are gonna be up soon

Log Sheet Mulder || 10.3 || 1:29 || Talking about groupwork and setup || Kohn || 10/3 || 1:30 || brainstorming and assigning research || Mulder || 10/6 || 4:46 || just checkin in to see if theres new stuff and to contribute new stuff || Kohn || 10/8 || 4:45 || checking the page and doing more research on mechanics || Mulder || 10/8 || 7:58 || Didnt actually do anything just checkin in || Mulder || 10/23 || 11:42 || Wrote down Nick and I and kinda Amayas research || Kohn || 11/11 || 8:35 || Modified Reseach Question, started Power Point and board information || with Mickey || Mulder || 11/14 || 10:32 || Made and uploaded pictures for the sling shot || took pictures that should be uploaded along with the data soon || Kohn || 11/18 || 8:00 || Go the pictures for the presentation from the site and checked disucussion. How do I load Powerpoint? || finish it? || Kohn || 12/2 || 7:30 || Finished board and powerpoint || Kohn || 12/3 || 8:35 || Tried to load powerpoint but the tree wouldn't work || Mulder || 12/4 || 9:16 || Also trying to load power point, but because my internet is dead it may take a bit || Mulder || 12/4 || 11:03 || Succsess!!!!! ||
 * Name(s) || Date || Time || Content ||
 * Mickey
 * nicksather || 10/3 || 1:28 || brainstorming and assigning research ||
 * Grace
 * AmayaB || 10/3 || 1:43 || talk about experiment and plan ||
 * Mickey
 * Grace
 * Mickey
 * Mickey
 * Grace
 * nicksather || 11/14 || 10:00 || Planned where and how to conduct the experiment
 * Mickey
 * nicksather || 11/15 || 3:00ish || Did first experiment with sling shot and got prelimary data
 * nicksather || 11/17 || 10:08 || Started a new discussion topic. So add some input. ||
 * Grace
 * nicksather || 11/26 || 3:00 || Worked on the board. Sorry I couldn't stay longer. Did you guys
 * Grace
 * Grace
 * Mickey
 * Mickey