Tiffany SithiphoneWren JacksonEmily CromerEbony LemonsStephen Marshall

Function Over Fashion

Overview Steps

Pulley systems Inclines Track Mousetrap

Applied concepts Conservation of

momentum and energy

Torque Projectile motion

Operation Golf ball rolls down inclines

Ball falls into cup which pulls white cup and

releases marble

Runs off ramp into funnel

Operation

Marble falls onto track and triggers

mousetrap

Mousetrap triggers

pulley which raises flag

Pulley releases marble to group 7

Calculations Step I: The Decline.

Conservation of linear/rotational energy: m₁gh=½m₁v ₁ ²+½I ₁ ω ₁ ²

Step II: The Pulley. Torque (about pulley): τ=Iα=I Conservation of momentum (inelastic

collision): m₁v ₁+ m₂v₂=(m ₁+ m₂)v’

Step III: The Curved Decline & Funnel. Conservation of energy: mgh=½mv²

Step IV: The Track & Mousetrap. Mousetrap and track—Conservation of

energy and elastic potential energy Step V: The Pulley & Flag.

Torque (about pulley) Conservation of rotational energy

Subscripts:1 golf ball2 cup & marblesp pulley

Setbacks Finding a ball heavy enough to execute

the first pulley Placing the cup in an accurate position for

the golf ball to fall into. Estimating the correct distance between

the curved decline and the funnel in order to project a marble into the funnel

Setting a precise amount of tension in the string on the second pulley to raise the flag

Summary

Factors that weren’t calculated affected movement of the project

Multiple test runs wore out certain parts of device

Simplicity is key