# Physics 111-01 Spring 2016

## General Physics 1: Final Exam Wed. May 18, 10:45AM-1:15PM

### Class Info

Instructor: Jessica Fielder

Class meets MWF 11:10AM - 12:00 PM in Science 101

Office: Science 356

Office Hours: Tuesdays 11AM-3PM, Wednesdays and Fridays 2-3PM, Thursdays by appointment

Email: jfielderATsfsuDOTedu (Replace AT and DOT with appropriate symbols and include "Phys 111" in subject line)

Syllabus: PDF

Homework: Registration Instructions for Mastering Physics

Voting Card: PDF

Physics and Astronomy Department's Plaigiarism Policy and Withdrawal Policy

Help Sessions for Phys 111/112 (free, drop-in help with any Phys 111 material)

Looking for a tutor? Here's a comprehensive list of tutoring services at SFSU, listed by subject.

### Class Announcements

Current Reading: None! Study for the final

5/16/16: Today's class we spent working on practice problems (see posted above).

5/13/16: We finished off thermodynamics today by doing a couple of examples using heat engines and refrigerators, and evaluating them according to the laws of thermodynamics. I also talked about entropy a little bit at the end of class.

5/11/16: Today we went over how the thermal energy of a gas is related to temperature and number of atoms, then did a couple of voting questions. Next I went over the zeroth, first, and second laws of thermodynamics and started setting up an example for how to test these for a heat engine process. At the end of class I collected topic requests for Monday's review session.

5/9/16: I started class by going over convection and radiation as heat transfer processes, then we returned to our discussion from Friday's class and did a short participation question on cooling off coffee. I also did an example problem using the radiation formula. We ended class by talking about the physics version of the ideal gas law and kinetic theory of gases.

5/6/16: Today we started class with a voting question on thermal expansion, then went over the definition of heat and how it flows between objects in thermal contact. Next I talked a little about specific heat capacity, and then we did a small group discussion about methods of heat transfer for cooling off a hot cup of coffee. Next, I introduced the three main heat transfer processes and started talking about conduction.

5/4/16: Our main focus today was on temperature scales. I talked about how temperature is defined by the small motions of particles in a system, and then went over the Kelvin scale for temperature and absolute zero. I also talked about how energy transfer processes can never have perfect efficiency.

5/2/16: I spent some more time today talking about flotation and Archimedes' Principle, and did an example problem and a few demonstrations of how they work together. I then quickly went over Pascal's principle describing how pressure in a liquid works, and then how Bernoulli's principle describes the interplay of flow rate and internal pressure in a fluid as an expression of energy conservation.

4/29/16: Today we took the third midterm during class. Scores will be posted on iLearn later next week.

4/27/16: Today's class focused on pressure in fluids and buoyancy. I talked about how the pressure in a liquid depends on the density of the liquid (a more dense liquid exerts more pressure), and on the depth (deeper = more pressure). Next we talked about how the total pressure acting on an object exerts a net buoyant force upward, and that if the buoyant force is greater than the weight of the object then the object will float. I also introduced Archimedes' Principle for calculating the strength of the buoyant force, and we ended class with a couple of voting questions about buoyancy and flotation.

4/25/16: We began class today by going over how to calculate the path difference for either constructive interference or destructive interference, and then quickly went over beat frequency. Next, we shifted into our section on different materials by going over density and pressure. We ended class with a few voting questions about how pressure is related to force and area.

4/22/16: I started off class today by going over wave interference, and showing examples of constructive and destructive interference and the superposition principle. Next, I talked about standing waves on a string (which is fixed at both ends) or in a column of air (which can be open at both ends, at one end, or closed at both ends). We went over how to calculate the harmonic frequencies for these different scenarios, and I demonstrated how this works for waves on strings by playing the ukulele.

4/20/16: We spent today's class going over the Doppler effect for sound waves. I talked about how the frequency and thus pitch of a sound wave changes depending on the motion of either the wave source or the observer, and we broke down how to use the Doppler effect equation using an example problem. I also collected our participation activity using part of the example.

4/18/16: I spent the first half of today's class going over the intensity of sound waves and the decibel scale. We learned that wave intensity decreases with the distance squared, and talked about other inverse-square relationships that pop up all over physics. I also did an example problem with intensity and the decibel scale, and talked a little about some properties that distinguish sound waves from light waves in terms of needing a medium through which to travel.

4/15/16: Today we started by looking at the equation describing a wave's velocity based on wavelength and either frequency or period, then looked at how we can borrow ideas from simple harmonic motion to write an equation describing how a waveform changes over time. Next we did a short worksheet to get more familiar with basic wave properties, then I went over the equation for the speed of waves on a string and did an example problem.

4/13/16: I started class today with another simple harmonic motion example using conservation of energy techniques, then moved on to wave properties. I talked about wavelength and frequency, and did a demonstration of the difference between transverse waves and longitudinal waves. We also talked about how sound waves propogate through air, and how the mechanical waves we'll discuss in Phys 111 require a medium (whereas the electromagnetic waves in Phys 121 do not).

4/11/16: We continued with simple harmonic motion today by looking at the pendulum and seeing how it can also show the same kind of behavior as a mass-on-a-spring, as long as we restrict the pendulum to small angles (less than about 15 degrees). Next, I went over the frequency and period equations for both a pendulum and a mass-on-a-spring, then we did some voting questions and an example problem.

4/8/16: I started off class today by talking about center of mass, then we did a participation activity involving center of mass and I did a couple of short examples. I spent the second half of class introducing the idea of simple harmonic motion, specifically the mass-on-a-spring.

4/6/16: We spent today's class going over how to do statics problems, where the sums of all forces and torques acting on an object are equal to zero. I also showed some examples of how to do free-body diagrams now that we have to consider torques.

4/4/16: I used today's class to talk more about torque, and introduced the rotational equivalent of Newton's second law (which uses net torque, moment of inertia, and angular acceleration instead of net force, mass, and linear acceleration). Next we did a couple of examples using torque, then I talked about statics problems and did a third quick example problem.

4/1/16: Today we took the second midterm during class.

3/30/16: We started class with some demonstrations of moment of inertia, then did an example using rotational kinetic energy in a conservation of energy problem. Next, I introduced the concept of torque and talked about how it depends on the strength of the force and where the force is applied to an object with respect to the pivot point. I then went back to our example and showed how friction is the force that causes objects to roll without slipping along a surface due to the torque it exerts on an object.

3/28/16: I began class with a rotational kinematics example problem, then we talked about rotational inertia (also called moment of inertia) and what makes it harder or easier to rotate an object. I also did a prediction for a demo we'll see on Wednesday, and finished up class by talking about rolling without slipping.

3/18/16: We spent class today doing two example problems: one involving the angular and tangential speeds of a pair of gears connected by a chain, and another that involved analyzing rotational quantities of various objects in this video of a corgi on a carousel. We worked in small groups for both activities, and I went over some of the answers with the class as a whole.

3/16/16: We started class with one last example problem using conservation of momentum, then moved on to talk about rotational motion. I defined the basic quantities of angular distance, angular velocity, and angular acceleration and we looked at some of the parallels between linear kinematics and rotational kinematics.

3/14/16: Today's class focused on using conservation of momentum to analyze collisions between objects. I talked about the different types of collisions (elastic, inelastic, and perfectly inelastic) and we did a demonstration using a wooden block and two darts. I used the demonstration to ask the class our participation question for the week, and we did an example problem using the impulse-momentum relationship.

3/11/16: I started class with an example problem involving conservation of energy and non-conservative work, then went over the definitions of impulse and momentum. We did a couple of example problems involving impulse and momentum, and I used car safety features as a way to illustrate some of those concepts.

3/9/16: We spent today going over conservation of energy and talking about conservative and nonconservative forces. I showed how conservation of energy can be used to get the same result for a free fall problem as using Newton's Laws and kinematics, and then we did a small group activity and participation question using conservation of energy.

3/7/16:Today's class began by introducing a new concept: work. I talked about the physics definition of work, and how it's calculated from force and displacement. Next we did an example using a box sliding down a ramp and calculated the amount of work done by the various forces involved, and the total work done. We did a couple of voting questions to see how work depends on displacement, and then ended class by introducing kinetic energy and the work-KE theorem.

3/4/16:I began with a recap of springs from last time, and we did a voting question to test our understanding of the spring force as a restoring force. Next I talked about centripetal acceleration, how to identify which force in a circular motion problem is the centripetal force, and we did an example problem using the centripetal acceleration equation in a Newton's Laws context.

3/2/16:Most of today's lecture was spent doing a Newton's Laws problem using an inclined plane and a pair of connected objects. At the end of class I also introduced Hooke's Law for the force supplied by springs.

2/29/16:We spent today's class going over Newton's laws problems on tilted surfaces.

2/26/16:Today we took the first midterm during class.

2/24/16:I started off class today by going over how the frictional force is related to the strength of the normal force on an object, and talked a little about the coefficient of friction. We spent the second half of class doing an example from last week's worksheet.

02/22/16:Our guest speaker for today's class introduced the basic reasoning behind equilibrium problems using Newton's 2nd law, and then spent the rest of class doing examples.

02/19/16:Today's class focused on using Newton's Laws to solve problems involving forces. I went over how to draw a free body diagram to organize all the forces acting on an object, how to calculate the weight force acting on an object, and we did some worksheet problems using Newton's 2nd law.

02/17/16:I started off today's class by giving a very brief overview of projectile motion and how it can be described using a specific application of the kinematics equations, then shifted gears and talked about forces. We did a participation activity about Newton's laws, and I went through each one and defined how we'll use them in this class.

02/15/16: Our guest lecturer spoke today about vector components and vector addition, and we did several voting questions throughout class to reinforce these concepts.

02/12/16: Today's class began with the exciting announcement that the LIGO team has successfully detected gravitational waves, and then we went into a free fall example problem. Next, we reviewed some of our previously-covered material on vectors, then started looking at the graphical methods for adding vectors.

02/10/16: I started off class with another example problem, and showed how to use either motion graphs or the kinematics equations to solve the problem. Next we talked about free fall problems, and I definied how we'll use g, the acceleration due to gravity, for these problems. I also did a demo showing the difference between air resistance and no air resistance, and talked about some key phrases that often come up in free fall problems.

02/08/16: Our guest lecturer spoke today about the kinematics formulae, and did several example problems and voting questions to connect the equations to our previous classes on motion graphs.

02/05/16: We spent today's class connecting the vector nature of motion quantities back to graphs of position, velocity, and acceleration vs. time. We also did a small-group tutorial on motion graphs, and I went over some of the trickier questions at the end of class.

02/03/16: Our main focus for today was the vector nature of velocity and acceleration, and their connection. I talked briefly about representing vectors in magnitude-angle format or in components, and did an example switching between the two. Next we did a participation activity where we interpreted the direction of the velocity and acceleration vectors describing the motion of a few different trips. On Friday we will return to connect these ideas to motion graphs.

02/01/16: We started today's class by going over the concept of displacement, and I talked a bit about vectors and did an example illustrating the difference between distance and displacement. Next, we did a short set of tutorial problems in small groups to get practice with these concepts, and at the end of class I went over the main ideas and some sticking points from the tutorial.

01/29/16: Today we started class with a short discussion of units and sig figs, and I talked about how we'll treat sig figs in this course. I also did an example of how to convert units, and talked about how dimensional analysis can help in solving problems. We ended class by introducing some of the quantities used to describe motion: position, velocity, and acceleration.

01/27/16: Welcome to Physics 1! I spent most of class today going over prerequisites and enrollment, then talking about the main points of the syllabus. We modeled how the voting cards will be used to do practice multiple-choice questions in class, and on Friday I will collect a signed copy of the student contract from everyone for participation.