Phys4:Alpha Particles Phys4:Beta Decay Phys4:Collision Example Phys4:E=mc^2 Phys4:Elastic vs. Inelastic Collisions Phys4:Electron Capture Phys4:Fission & Fusion Phys4:Gamma Rays & Annihilation Phys4:Halflife Phys4:How Machines Work Phys4:Impulse Phys4:Levers Phys4:Momentum Defined Phys4:Momentum vs. Inertia Phys4:Positron Emission Phys4:Pulleys Phys4:Ramps Phys4:Reverse Collisions Phys4:Solving Collision Problems Phys4:The Reason for Machines