Different Types of Collisions
- Conservation of momentum occurs in all of these collisions!!
- Elastic collisions
- Hard collisions = no deformation occurs
- Conservation of momentum and conservation of energy
- Example: Billiards
- Inelastic collisions
- Deformation occurs
- Momentum is conserved but kinetic energy is lost
- Most collisions are inelastic (bounce off and energy is lost)
- Objects move with different final velocities (don't stick together)
- Perfectly inelastic (stick together)
- Objects stick together and travel as one object and deformation occurs
- Momentum is conserved but kinetic energy is lost
- After the collision there is 1 velocity
- Example: Bullet and wood block
- Explosions
- Reverse of perfectly inelastic collisions (kinetic energy is gained)
- Momentum of the center of mass remains unchanged
Impulse
- Impulse- Force exerted over a time
- Abbreviation : J
- J = Force * change in time
- Area under a Force vs. Time graph
- You can use the average force instead of integrating
- Units: N * s or kg * m/s
- Impulse is the same as change in momentum!!
Momentum
- Momentum- How hard it is to stop something
- NOT INERTIA (inertia is the resistance to any chance )
- Depends on mass and velocity
- Abbreviation : p
- Momentum = Mass * Velocity (p = mv)
- Change in momentum = Impulse
- Momentum is a vector with the same direction as the velocity
- Same units as impulse (N * s or kg * m/s)
LIL Charts - Qualitative drawing of the change in momentum and impulse to help us make predictions about a situation.Below are some examples from the Momentum and Impulse Labs. The different colors represent different carts.
Conservation of Momentum
- Isolated systems: Momentum is conserved pi = pf
- All other systems: pi + J = pf
- Center of mass of the system will always maintain the same momentum
Relating Momentum, Energy, Forces, and Kinematics
Intro to Momentum Mastering Physics Notes.pdf | |
File Size: | 875 kb |
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