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General Physics 151 Week 6 Notes

by: Lindsey Notetaker

General Physics 151 Week 6 Notes PHYS151

Marketplace > University of Nevada - Las Vegas > Physics > PHYS151 > General Physics 151 Week 6 Notes
Lindsey Notetaker

GPA 3.585

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All notes that are taken from the lecture will be the first section, notes I take from the textbook will be the second section, and the vocabulary words from the chapter with definitions will be th...
General Physics I
Dr. Pang
Class Notes
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This 3 page Class Notes was uploaded by Lindsey Notetaker on Thursday October 13, 2016. The Class Notes belongs to PHYS151 at University of Nevada - Las Vegas taught by Dr. Pang in Fall 2016. Since its upload, it has received 4 views. For similar materials see General Physics I in Physics at University of Nevada - Las Vegas.


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Date Created: 10/13/16
General Physics 151 Week 6 Notes (October 3, 2016) Chapter 6: Momentum and Collision Key to my notes: all notes that are taken from the lecture will be the first section, notes I take  from the textbook will be the second section, and the vocabulary words from the chapter with  definitions will be the last sections! For this one it goes from 6.1 to 6.3 (:  Lecture Notes  Look at the duration force  o This is the impact   Impulse is the measure of the duration effect of a force, defined as: o Impulse =  (Average Force) X (change in time) o SI unit is Newtons X Seconds  o Two ways to increase the impulse  Increasing average force   Increase interaction duration change in time  o It a vector   Momentum is a collective measure of mass and velocity of an object  o Power= mass X velocity  o SI unit is Newtons X Seconds  o Impulse­momentum theorem   Impulse=change in power  o Scalar equation   Need to look at all the forces and then look at the systems   The bigger vehicle, the more momentum   Free falling motion is found by the negative square root of (2 X gravity X height)  o The impulse then equals change in power   (change in mass) X (final velocity –initial velocity)   For a one particle system you find by subtracting the initial particle location form the  final particle location o This equals impulse which equals average force X change in time  o When the impulse is zero, it means the particle is in space and it stays in the  current state  o Can be a vector equation so can be broken down to components    For a two particle system, it is like a collision o The change in particle 1 = particle 1­ opposite particle 1 = (average external force  + average force between particle 1 and 2) X change in time o The change in particle 2 = particle 2­ opposite particle 2 = (average external force  + average force between particle 2 and 1) X change in time o Then you add them so it equals (average external forces added together) X change in time Page 1 of 3 General Physics 151 Week 6 Notes (October 3, 2016)  For elastic collision the change in kinetic energy is zero or you find it by: o ((mass 1)/2 X initial speed of particle 1 squared) + ((mass 2)/2 X initial speed of  particle 2 squared) = ((mass 1)/2 X end speed of particle 1 squared) + ((mass 2)/2  X end speed of particle 2 squared)  For inelastic collision the change in kinetic energy is not zero   Example 3 in PowerPoint  o Power = mass object 1 X velocity object 1 + mass object 2 X velocity object 2  o Total energy= kinetic energy + potential energy   ((mass 1)/2 X initial speed of particle 1 squared) + ((mass 2)/2 X initial  speed of particle 2 squared) = ((mass 1)/2 X end speed of particle 1  squared) + ((mass 2)/2 X end speed of particle 2 squared) – (universal  gravity X ((mass object 1 X mass object 2)/(distance between the objects))  Kinetic energy= negative potential energy/2   For collision process when it is a ballistic pendulum for the moving process it can be  found by: o (mass X speed squared)/2 = mass X gravity X height   Mass is the addition of the two objects together   Mass object 1 X speed of object 1 = mass of both objects X velocity of  both objects   To find the percentage of the mechanical energy lost  o (initial kinetic energy­end kinetic energy)/initial kinetic energy   1­ (2(mass X gravity X height)/(mass object 1 X speed object 1 squared)  Only going to deal with ONE­DIMENSION   Always try to make equations into a linear equation (everything to first power)  Algebra equation you should know o A^2 – B^2 = (A – B)(A+B)  Textbook Notes  Looking at collisions need to look at impulses because collisions happen within  milliseconds  o To find impulse when it is a constant force then you multiply the constant force  by the change in time  o To find impulse when it is not a constant force then you split it into the  components and find the average over the change in time  Momentum (p) = mass X velocity  Average force X change in time = impulse o It can also be found by finding the change in momentum  Page 2 of 3 General Physics 151 Week 6 Notes (October 3, 2016) When there is two or more particles involved you would add up the momentum of each  point to find the total  Force = change in momentum/ change in time  If there is more than one particle, then you break it into the components and add them  together  For an elastic collision it is when the change in kinetic energy is zero o Can be solved by:  (mass final object 1/2) X (final velocity object 1 squared) + (mass final  object 2/2) X (final velocity object 2 squared) = (mass initial object 1/2) X (initial velocity object 1 squared) + (mass initial object 2/2) X (initial  velocity object 2 squared) o Initial velocity of object 1 has to be more than the initial velocity of object 2  For an inelastic collision it is when final kinetic energy is less than the initial kinetic  energy o A special type is a complete inelastic collision which is when after the collision  the two objects are stuck together  o Most inelastic collisions tend to be in one direction which makes it easier to solve  because you do not have to split it into the components  o Sometimes if the mass of one object ends up adding to the final mass of the object (ex. A bullet being shot at a sand bag and then getting stuck in the sand bag) then  make you add both masses Vocabulary Words       Impulse: the product of a force over its elapsed time of action      Momentum: a collective measure of mass and velocity possessed by an object      Elastic Collision: a collision of two protons without producing any new matter.      Inelastic Collision: a collision that involves converting a portion of the kinetic energy of  the colliding objects into some other forms of energy is called an      Completely Inelastic Collision: A special case of inelastic collision has the two objects  moving together after the collision Page 3 of 3


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