Projectiles 2 - Time of Fall

[Lab Index]

BHS -> Staff -> Mr. Stanbrough -> AP Physics -> Kinematics -> this page

The vertical component of the motion of a projectile is free fall. This means, for instance, that if you roll a marble off the edge of a level desk, the time that it will take to hit the floor depends only on the height of the desk - not on its initial speed. This can be difficult for beginning physicists to digest, so here is a simulation that may help. In this simulation, you will launch 5 projectiles horizontally from the same position at the same time - all with different horizontal velocities, and observe their fall.

The Simulation:

1. Open the Interactive Physics program.
2. Go to the Workspace submenu of the View Menu and select "Grid Lines".
3. Go to the Tracking submenu of the World Menu and select "Every 16 frames".
4. Create 5 new circle objects ().
5. Select all 5 new objects, and:
1. select "Do Not Collide" from the Object Menu.
2. Open the Properties Window and set:
1. x = 0.0 m
2. y = 0.0 m
3. Open the Appearance Window and check the "Track Connect" box.
6. Open the Properties Menu and give each mass the horizontal velocity shown in the table (Mass[1]'s velocity stays 0.0):

Mass #

vx

(in m/s)

2
2
3
4
4
8
5
16