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This 1 page Study Guide was uploaded by Usman Qureshi on Wednesday November 18, 2015. The Study Guide belongs to a course at a university taught by a professor in Fall. Since its upload, it has received 14 views.
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Date Created: 11/18/15
3 Last Lecture 3Combining momentum and energy 3Today 32D collisions 3 Important Concepts 3Momentum is a vector energy is not 3Think carefully about internal versus external forces 3Energy changes due to forces along the motion momentum changes due to external forces acting over a period of time 801 L Fall 2005 11102005 Important Reminders 3 Pset 7 due Today 3Leave it here now or drop it at my office before 630pm 3MasteringPhysics due next Monday 3 Experiment 5 next Tuesday 3 Pset 8 due next Friday 3 No class tomorrow 801 L Fall 2005 11102005 Techniques you should know 3 Kinematics 3Positionvelocityaccelerationtime 3Useful for constant acceleration or formulas for x vs t 3 Fma 3Frequently needed along with other techniques 3Work amp Energy 3Speed at points A amp B PE known forces along motion 3 Momentum 3Collisions objects come together or fly apart 801 L Fall 2005 11102005 ProblemSolving Strategy 4steps 3Don t try to see your way to the final answer 3Focus on the physical situation not the specific question 3Think through the techniques to see which one or ones apply to all or part of the situation 3Focus on the conditions under which techniques work 3Think carefully about the geometry 3Here is the one place where lots of practice can help 3Make sure you are efficient in applying techniques 3Here is one place where memorization can help 801 L Fall 2005 11102005 Helpful Hints 3 Don t memorize special cases Nmg for example 3Think about why things you write are true 3For example never write uN without thinking or preferably writing down why that is true 3 Draw a careful picture 3Think about special cases 00 for example to check that you have the geometry correct 3Watch out for missing minus signs 801 L Fall 2005 11102005 Momentum 3Very simple formula TOZ 2mil7i 39 F 3Note the vector addition APT Jth 3Momentum of a system is conserved only if 3No net external forces acting on the system 30r study the system only over a very short time span 3Collisions in 2 dimensions add another equation for the second component but otherwise are not new 3Momentum can be used to find 1 unknown per spatial dimension WorkampEnergy can be solved for 1 unknown 801 L Fall 2005 11102005
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