1 / 7

Conservation of Momentum

Conservation of Momentum. It’s the Law!!!!!!!!!. We have already learned that the momentum of an object is equal to the mass of the object multiplied by its velocity:.

masato
Download Presentation

Conservation of Momentum

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Conservation of Momentum It’s the Law!!!!!!!!!

  2. We have already learned that the momentum of an object is equal to the mass of the object multiplied by its velocity: We also know that if we want the momentum of a system we must combine the momenta of each object in the system, remembering that momentum is a vector. We also learned that the impulse on an object was equal to the net external force on the object multiplied by the time the net external force is applied to the object: Finally we also learned that impulse on a system is equal to the change in momentum of the system. As an equation this looks like:

  3. What happens if there is no net external force acting on the object? This means that if there is no net external force on a system, then: 1) The momentum of the system doesn’t change (It is conserved) 2) The initial momentum of the system equals the final momentum of the system. () THIS IS THE LAW OF CONSERVATION OF MOMENTUM

  4. Momentum Example 7: Rifle Recoil Calculate the recoil velocity of a 6.5 kg rifle that fires a 0.025 kg bullet at 525 m/s. Before the rifle is fired the system is at rest so: After the rifle is fired the momentum of the system is still zero since the forces involved are only internal. So:

  5. Momentum Example 8: Blobs of Putty Two blobs of putty are traveling towards each other at the 10-m/s. If one blob of putty has twice the mass of the other blob of putty, how fast would the blobs be traveling after the collision if they stick together? {This is called an inelastic collision} 2m m Before Collision 10 m/s 10 m/s v After Collision 3m Since momentum is conserved (all forces are internal):

  6. Now, print off your online assignment and start it. You will not be able to get to it this weekend due to maintenance by UT!!!!!!!!

  7. Momentum Example 9: Elastic Collision A 2.0-kg ball is moving towards a 3.0-kg ball at 3.0 m/s. The 3-kg ball is moving towards the 2.0 kg ball at 4.0 m/s. If the two balls hit each other, what is the speed of the 3.0-kg ball after the collision if the 2.0-kg ball bounces back at 2.0-m/s? 3.0 kg 2.0-kg Before Collision 4.0 m/s 3.0 m/s 3.0 kg 2.0-kg After Collision v 2.0 m/s Since momentum is conserved (all forces are internal):

More Related