Site 2: http://phet.colorado.edu/simulations/  click on projectile motion link  click on “run now”
Simulation tips:
The square yellow box can be used to measure distance.
If you need to reset simulation to its original starting points, enter these value: Angles = 80; Initial speed = 18; mass =2, diameter =.1.
You can see the range, height and time in the top boxes.
Instructions: Answer these questions by changing the variables. Remember it is best to change only one variable (the one you are testing) and leave the others constant.
Question 1: If you cut the projectile’s velocity in half, will the range also be cut in half. Show your data below. (Make sure air resistance is not checked.)
Choose ONE projectile to test: Golf Ball Bowling Ball Pumpkin Adult Human  
Velocity  4 m/s 
8 m/s 
16 m/s 
32 m/s 
64 m/s 
Range 





Answer to Question 1: 

Graph the data. Place velocity on the X axis and Range on the Y axis
Question 2: How does air resistance affect these distances?

Range; Launch at 18 m/s and Angle 60 degrees 


No Air Resistance 
With Resistance (check box) 
Tank shell 


Golf ball 


Baseball 


Bowling Ball 


Football 


Pumpkin 


Adult Human 


Piano 


Buick 


Answer to Question 2: 

Based on the data you gathered (above), complete the set of sentences?
a. Objects that are round, like baseballs and golf balls will travel [ farther  not as far  the same distance ] if there is air resistance.
b. Objects that are shaped like a bullet, like the tankshell will travel [ farther  not as far  the same distance ] if there is air resistance.
Question 3: What angle, speed and mass can be used to hit the target?
Place your target so that it is exactly 20 meters from the cannon. Use any angle, velocity, or object to hit the target. When you are successful, indicate on the table below the combinations that work.
There are several answers here; you just need to find three that work.

Angle 
Speed 
Mass (object) 
Target Hit 1 



Target Hit 2 



Target Hit 3 


