1. Momentum General Physics

2. Momentum Mass in motion Symbol: p Equation: p = m  v Units: kg x m/s Vector quantity

3. Momentum and Impulse Need a force over a period of time to change an object’s momentum

4. Impulse-Momentum Change Equation F = ma F = m  v/t Ft= m  v = p f -p i Impulse = change in momentum

5. Real-Life Application Following through while swinging a bat Airbags Nylon ropes in rock climbing

6. Conservation of Momentum In a closed system: momentum of objects before a collision = momentum after collision p Ai + p Bi = p Af + p Bf

7. Elastic Collision Objects do not stick to each other Kinetic energy remains the same http://www.physicsclassroom.com/mmedia /momentum/cthoe.cfmhttp://www.physicsclassroom.com/mmedia /momentum/cthoe.cfm

8. Inelastic Collision Objects stick together Some kinetic energy is converted to thermal energy http://www.physicsclassroom.com/mmedia /momentum/cthoi.cfmhttp://www.physicsclassroom.com/mmedia /momentum/cthoi.cfm