1. The Lazy Dog Printing Press
Team Members:
Mandi Hall
Rob Wilkins
Jennifer Williams

2. The Team

3. Materials Plywood Balsa Wood Spring Funnel Golf Ball Stamp Felt Hinge
Super Glue

4. Introduction
The goal of our device is to successfully stamp a piece of paper.
The golf ball launches from the platform, then knocks a ball loose. The balls then flip a handle and release the stamp.

5. The Lazy Dog Printing Press

6. Projectile Motion Trajectory Equation
(y-y0) = tan(Θ)*(x-x0)-(g/(2v02))*(1+tan2(Θ))*(x-x0)2
The first golf ball is launched into the funnel by a spring.

7. Conservation of Momentum
COM Equations:
mA*vA + mB*vB = mA*vA’ + mB*vB’
e = -(vB’ – vA’)
vB – vA
The first golf ball collides with the second tipping the third ball in.

8. Conservation of Energy
COE Equation:
1/2mvo2+mgh0+1/2kxo2+Win = 1/2mvf2+mghf+1/2kxf2+Eloss
When the golf balls strike the handle and release the stamp energy is conserved.

9. Conclusions Conservation of Energy Conservation of Momentum
Achieved with stamp
Conservation of Momentum
Achieved with golf balls
Projectile Motion
Achieved with launcher
Repeatability
It works almost every time