# Momentum & Collisions

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1. momentum
product of an object's mass and velocity p=mv
2. SI units for momentum
kg*m/s
3. what happens to momentum as velocity and mass increase
heavier objects and faster objects have more momentum; lighter and slower objects have less momentum
4. impulse momentum theorem
• fΔt=Δp
• the product of a net external force applied to an object and a certain time interval will be the change in momentum
5. impulse
product of the net external force and the time over which it takes to act on the object
6. relationship between time interval and momentum
• extending the time interval over which a constant force is applied allows for a smaller force to cause a greater momentum change
• a momentum change over a longer time period requires less force
7. law of conservation of momentum
• total momentum of all objects interacting with each other remains constant regardless of the nature of the forces between objects
• can't create or destroy momentum
8. elastic collision
• objects return to original size and shape, they stay looking the same
• remain separate after collision
• momentum and KE conserved
9. inelastic collision
• object deforms and changes size and shape, doesn't look the same afterwards
• loss of KE, work is done, p conserved
• objects don't stick after collision, masses bounce off each other
10. perfectly elastic collision
• two or more objects collide and stick together
• masses joined and they move with the same velocity
• p conserved, KE lost
 Author: Gymnastxoxo17 ID: 270791 Card Set: Momentum & Collisions Updated: 2014-05-25 15:38:04 Tags: Chapter Six Folders: H Physics Description: k Show Answers: