Works Over TimeEric LarsonWren JacksonChristian Moore

Works Every Time

ERIC LARSONWREN JACKSONCHRISTIAN MOORE

Overview Steps

Circular Motion Inclines Gravity Mousetrap Pulleys

Applied concepts Conservation of

momentum and energy

Torque Forces

Operation 1. Marble rolls

around bottle onto track

3. Ball falls through wood

boards and onto the mouse trap,

triggering it

2. Ball runs through track

Operation

4. As mouse trap is triggered, the plank under 2nd marble is pulled away. Releasing marble

6. Pulled wire goes through pulley and triggers the remote car moving car forward

5. Falling marble triggers the 2nd mouse trap, pulling wire

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

Subscripts:1 marblep pulley

Variables:m massg gravityh heightv velocityI mass moment of inertiaω angular velocityk spring constantx distance of compressionE energyτ torqueT tensionR radius of pulley

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

Summary

Factors that weren’t calculated affected movement of the project

Simplicity is key