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by: Heath Hane III


Heath Hane III
GPA 3.82


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Class Notes
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This 4 page Class Notes was uploaded by Heath Hane III on Saturday September 12, 2015. The Class Notes belongs to PHYS 1111L at University of Georgia taught by Staff in Fall. Since its upload, it has received 295 views. For similar materials see /class/202491/phys-1111l-university-of-georgia in Physics 2 at University of Georgia.




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Date Created: 09/12/15
Physics 1111 Surviving the Final Exam FOXTROT by Bill Amend WHAT ARE STUDYING Fmq You Dome FDR OUR ouR PHYSICS 50 I39M A TEST WAS PROGRAS YESTERDAY TINATDR Studying Strategies Begin by prioritizing what you need to work on Review your homework and exams looking for weaknesses Do certain sectionschapters give you trouble Are the conceptual questions your Achilles7 heel What part of the problem solving process is the most dif cult or time consuming for you We7ve covered a lot of material in one semester Although doing is more effective than just seeing working as many practice problems as you possibly can do may not help you much at this point simply because of the vast variety This doesn t mean you shouldn7t work through problems just that you should emphasize quality over quantity Problems from the in class exams are good practice especially if you try to work them under simulated exam conditions77 As you work through problems be mindful of your problem solving process Ask yourself what you7re doing and how you typically approach a problem Justify your reasoning for each step of a solution does the progression of steps toward the answer make sense Work from the formula sheet as much as possible and rely on the textbook as little as possible Make sure you can identify every equation on the formula sheet and when its valid to use For any that you7re not absolutely sure about take out a separate sheet of paper write down the equation and detailed descriptions of each variable and then nd a practice problem that you expect will use this formula Then verify your prediction If you feel con dent in your algebra or calculator skills then you don7t necessarily need to take the time to thoroughly solve every practice problem It may be enough for you just to go through the setup and reasoning Dissecting a Problem These steps will help narrow down which formulas may apply to the problem Remember that for a given problem7 there may be several categories of motion7 for different objects or different time intervals De ning the System C O 0 Which objects are relevant What7s inside vs outside the system What are the initial and nal events of interest Are there multiple such events Categorizing Forces 0 O O O O Q Which object feels each force Where on the object does the force act What7s causing each force Actionreaction pairs Contact or non contact force Constant or not Conservative or non conservative force Does work or not lnternal or external force Categorizing Motion 0 O O O O O O O Constant acceleration motion eg7 free fall7 projectiles also constant velocity motion Uniform circular motion lmpulsive motion eg7 collisions7 explosions General translational motion Constant angular acceleration motion Rigid object rotational motion Static equilibrium Simple harmonic motion Wave motion The Big Principles 0 Describing Motion with Vectors and their components 0 Newton7s Laws and free body diagrams 0 Extended Work Energy Theorem and energy conservation 0 Linear Momentum and its conservation 0 Angular Momentum and its conservation If you remember nothing else in physics7 remember these The conservation laws only apply if the system satis es certain restrictions be sure you know when and when not to use them Energy is an incredibly versatile concept It can be applied to almost any motion7 especially to the general categories of motion with non constant accelerations If a question asks for a position or a velocity7 energy is often the best way to solve it Energy methods won t directly provide answers for time7 force7 or acceleration Momentum linear and angular is primarily of use for impulsive motion collisions and explosions The Night Before the Exam Read anything besides your notes or textbook7 since you7ve already been studying for days Get a full night7s rest7 or nap before the exam On Exam Day H Don7t panic Pace yourself7 and take regular small breaks to stretch or breathe deeply If you get stuck on a problem7 come back to it later Don7t waste your time staring at the page and getting discouraged Sometimes while working on another question7 something will click for you on the previous problem E0 Leave nothing blank or unexplained Demonstrating your solution process is at least as important as getting a nal numerical answer You wont get much credit on the quantitative problems without showing your steps or explaining your reasoning If you can7t nd a result that you need to use later in the problem7 assume a reasonable value and make it obvious that you7re doing so and keep working On the other hand7 explaining in detail what you would do to solve a problem7 without working towards actually solving it7 is a waste of time 9 Conceptual reasoning is important too Don7t try to do the multiple choice and ranking problems all in your head Just because you7re not required to explain your answer7 doesn7t mean its always possible to answer these questions without writing down something or drawing yourself a diagram The cleanest7 least scribbled on pages are typically the lowest scoring 4 A diagram7s worth a thousand points Well not quite but accurate diagrams are the key to analyzing many problems correctly Distinguish between quick sketches of a problem and more rigorous free body diagrams You need to draw a free body diagram for each relevant object if you7ll be working with forces or torques because the whole point of a FBD is to show the forces on an object and where they act A FBD may not be necessary in other cases 9 Use and understand the formula sheets There7s really no excuse for mistakes like K 77102 or 739 flu or thinking T 27rw refers to a tension force Every time I see this I sprout another gray hair 03 Check your work Do the signs in your equations and your results make sense ls the algebra correct Does the question ask for direction or just magnitude Does your answer have proper units and sig gs ls your calculator in the right mode degrees versus radians 7 Best of skill TopicRelated Tips H Use kinematics with care Know when its appropriate to use the kinematics de nitions andor the constant acceleration equations More importantly know when not to use them The de nitions are great when you need or have an average speed or acceleration but not so useful otherwise The equations are labeled constant aconstant a for a reason While some problems eg projectile motion inclined planes are constant acceleration many problems are not E0 Vector component directions are independent The big advantage of resolving vectors into components is that each direction can be treated independently This means that components from different directions rarely mix a caution ag should go up if you nd both z and y subscripts in a single equation 00 FBDs are for representing real forces It is meaningless to draw in arrows for torques or for F ma or for a eei itripetal radial force For every force that you draw you need to be able to identify what other object is causing that force Be absolutely certain the directions for forces are correct gravity points down tension points along a rope normal force is perpendicular to a surface friction is parallel to a surface etc Also be careful about making unwarranted assumptions about force directions eg hingesl r Keep forcetorque sums separate from Newton7s 2nd Law The real value of FBDs is that you can immediately turn the diagrams into math by writing down sums like EFE EFy and 2739 Each term in these sums represents an actual force that yone drawn This step should be completely separate in your mind from the step in which you apply Newton7s 2nd Law 2Fm max 2739 Ia and so on 9 Energy and momentum are your best friends These are some of the most useful concepts you will ever encounter in physics Anytime you want to nd velocity


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