1. Works Over Time Works Every Time Eric Larson Wren Jackson
Christian Moore
ERIC LARSON
WREN JACKSON
CHRISTIAN MOORE

2. Overview Steps Applied concepts Circular Motion Inclines Gravity
Mousetrap
Pulleys
Applied concepts
Conservation of momentum and energy
Torque
Forces

3. 1. Marble rolls around bottle onto track
Operation
1. Marble rolls around bottle onto track
2. Ball runs through track
3. Ball falls through wood boards and onto the mouse trap, triggering it

4. Operation
6. Pulled wire goes through pulley and triggers the remote car moving car forward
5. Falling marble triggers the 2nd mouse trap, pulling wire
4. As mouse trap is triggered, the plank under 2nd marble is pulled away. Releasing marble

5. Calculations Step I: The Decline.
Conservation of translational/rotational energy: m₁gh=½m₁v ₁ ²+½I ₁ ω ₁ ²
Step II: First Marble Drop.
Conservation of translational energy
m1gh= ½ mv2
Step III: First Mousetrap.
Energy of Mousetrap: E= ½ kx2
Step IV: Second Drop.
Conservation of translational energy
mgh = ½ mv2
Step V: Second Mousetrap.
Energy of Second Mousetrap: E = ½ kx2
Step VI: Pulley to Car Remote
∑τ = T1*R+T2*R
Variables:
m  mass
g  gravity
h  height
v  velocity
I  mass moment
of inertia
ω  angular velocity
k  spring constant
x  distance of
compression
E  energy
τ  torque
T  tension
R  radius of pulley
Subscripts:
1 marble
p pulley

6. Setbacks
Getting the marble to consistently land on the first mousetrap
Finding away for the second, large marble to land straight down without popping out
Making the tensions in the string just right to trigger the remote

7. Summary
Factors that weren’t calculated affected movement of the project
Simplicity is key