Momentum
Download
1 / 43

Momentum - PowerPoint PPT Presentation


  • 84 Views
  • Uploaded on

Momentum. Definition. Formula. Units. Momentum. Vector quantity Direction matches direction of velocity. Example #1. Impulse equals change in momentum…. Example #2.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Momentum' - griffith-gray


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript




Momentum
Momentum

  • Vector quantity

  • Direction matches direction of velocity




Example 2
Example #2

A 1400 kg car moving westward with a velocity of 15 m/s collides with a utility pole and is brought to rest in 0.30 s. Find the magnitude of the force

exerted on the car during the collision.



Example 3
Example #3

A 2250 kg car traveling to the west slows down uniformly from 20.0 m/s to 5.00 m/s. How long does it take the car to decelerate if the force on the car is 8450 N to the east? How far does the car travel during the deceleration?





Example 34
Example #3

4.00s


Practice 6c p213 1 3
Practice 6C p213 #1-3

  • Right now in class…


Why are dashboards in automobiles padded
Why are dashboards in automobiles padded?

  • Longer time interval requires a smaller force to achieve same momentum change




Momentum and collisions
Momentum and Collisions force decreases


Momentum is conserved
Momentum is Conserved force decreases

  • This section focuses on multiple objects interacting


Momentum is conserved1
Momentum is Conserved force decreases


Momentum is conserved2
Momentum is Conserved force decreases


Soccer ball example
Soccer force decreases Ball Example

  • Q: How do the force exerted on ball A and the time interval compare with the force exerted on the ball B and its time interval?

  • A: Forces are equal in magnitude and opposite in direction & time intervals are also equal.


Soccer ball example1
Soccer Ball Example force decreases

  • Q: How would you calculate the change in momentum of each ball?

  • A:The change in momentum of each ball is equal in magnitude but opposite in direction because P=F t


Conservation of momentum
Conservation of Momentum force decreases


Law of conservation of momentum
Law of Conservation of Momentum: force decreases

The total momentum of all objects interacting with one another remains constant

regardless of the nature of the forces between the objects.


No! Only way for the final momentum to be zero is for the initial momentum to be zero! Initially both skaters would have to have the same momentum in opposite directions….


Momentum of the spacecraft & its fuel before the rockets are fired must equal the momentum of the two after the rockets are fired…


Momentum and collisions1
Momentum and Collisions fired must equal the momentum of the two after the rockets are fired…


Example 4 conservation of momentum
Example#4 fired must equal the momentum of the two after the rockets are fired…Conservation of Momentum


Example 4 conservation of momentum1
Example#4 Conservation of Momentum fired must equal the momentum of the two after the rockets are fired…


Example 4 conservation of momentum2
Example #4 Conservation of Momentum fired must equal the momentum of the two after the rockets are fired…

  • Choose the formula:


Example 4
Example #4 fired must equal the momentum of the two after the rockets are fired…


Practice 6d p219 1 4
Practice 6D p219 #1-4 fired must equal the momentum of the two after the rockets are fired…


Perfectly inelastic collisions
Perfectly Inelastic fired must equal the momentum of the two after the rockets are fired…Collisions


Formula for perfectly inelastic collisions
Formula for Perfectly Inelastic Collisions fired must equal the momentum of the two after the rockets are fired…


Example 5 inelastic collision
Example #5-Inelastic Collision fired must equal the momentum of the two after the rockets are fired…


Elastic inelastic collisions
Elastic & Inelastic Collisions fired must equal the momentum of the two after the rockets are fired…


ad