Understanding Momentum: Conservation and Types of Collisions
In this unit, we explore the concept of momentum (p = mv) and its conservation during collisions. Momentum, like energy, cannot be created or destroyed, and the total momentum before and after a collision remains constant. We differentiate between elastic collisions, where no kinetic energy is lost, and inelastic collisions, where kinetic energy is lost. Additionally, we examine explosions, where kinetic energy is generated as objects move apart. Finally, we define impulse (J = F∆t = ∆p) as the change in momentum, represented by the area under the force vs. time graph.
Understanding Momentum: Conservation and Types of Collisions
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Presentation Transcript
Unit 5 Notes Momentum
p=mv • In the last unit, we learned about conservation of energy. • In this unit, we see conservation of momentum • Momentum (p) is equal to mass times velocity • *** P is for power. p is for momentum***
Momentum, like energy, can’t be created or destroyed. ∑mv = constant When two objects collide, m1v1 + m2v2 before the collision equals m1v1 + m2v2 after the collision.
Types of Collisions Elastic Collision: No kinetic energy is lost during the collision. Really bouncy objects can come close to this. Inelastic collision: A lot of kinetic energy is lost during the collision. Two objects combining together and moving away at a common velocity.
Explosion: Two objects move apart due to some sort of energy being converted to kinetic energy.
Impulse • J=F∆t = ∆p • This is the change in momentum. It is also the area underneath a force vs time graph.
