DOC PREVIEW
UNC-Chapel Hill PHYS 104 - Final Exam Study Guide

This preview shows page 1-2-3-4 out of 12 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 12 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 12 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 12 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 12 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 12 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

Phys 104Final Study GuideLecture 1 (August 25)- If you double the radius of a blowfish, by what factor does the volume increase?The volume increases by a factor of 8. The formula for V is (4/3) * pi * r3. If you change the formula to (4/3) * pi * (2r)3 and carry out the math, you will 8 * V.- What is the formula for density?density = mass/volumeLecture 2 (August 27)- What functions of a graph should you consider when determining best fit?quadratic, linear, exponential, power- Power LawsKnow how to carry out the math involving exponents.- What are the two systems of units?SI (metric) and the Imperial (British) system- Conversion factor for kg and lbs:1.000 kg = 2.205 lb- Conversion factor for mg and kg:1 mg = 1 x 10-6 kgLecture 3 (September 3)- Describe a push and a pull.An example of force. They result from an interaction between two bodies or a body and its environment. - What do you need to describe a force?Magnitude, direction, unit- What is the unit for force?Newton- What are quantities with direction called?Vector quantities- What are examples of scalar quantities?Surface area, volume, density- Basically explain gravitational force.Weight of an object (W). Force exerted by the earth.- In what direction are normal forces?Perpendicular to the contact surface.- According to Newton’s first law, when an object is at rest or moving at constant velocity, what is the sum of the forces?Net force = 0- F (B on A) = - F (A on B) is an example of what?Newton’s third lawLecture 4 (September 8)- Define displacement.Change in position in meters.- Is displacement a scalar or vector quality?Vector because it has magnitude and direction. - Basically speaking, what is velocity?The rate of change in position; basically the speed.- Describe the velocity of fast and slow objects.Fast objects experience large changes in small amounts of timeSmall objects experience small changes in large amounts of time. - Purpose of position vs. time graphObject is either speeding up or slowing down.- Purpose of velocity vs. time graphAcceleration = slope- Newton’s 2nd Law Equation:Fnet = m*aLecture 5 (September 10)- Gravitation force featuresnon-contact forces, magnitude of mg, points towards earth- FormulaFgrav = mgLecture 6 (September 15)- Tension force is usually exerted by what?The rope- What happens to the tension on massless ropes?The tension applied to one end is equal throughout the rope. - What is static friction force?The friction force exerted by the ground on the block.- What happens when the applied force overcomes the maximum static friction force?The block moves.- The maximum static friction is proportional/inverse to the normal force exerted by the object?ProportionalLecture 7 (September 17)- How does the change in length vary with force?o Linearly- What is the proportionality constant called?o Spring constant- What is Hooke’s law?o F = k * change in length- What is the quantity of tensile stress?o F/A- What is the quantity of tensile strength?o Change in length/length- What is the slope of the stress-strain curve called?o Young’s modulus- What is the largest stress a material can sustain?o Tensile strengthLecture 8 (September 22)- What is a point mass?o The analysis is only concerned with motion in a line- How do you describe an object at rest (zero net force)?o Static equilibrium- Of magnitude, mass, position, and angle, which affect rotation?o Magnitude of forceo Position of forceo Angle of force- What are the units of torque?o N*m- Does the tangential component contribute to torque?o Yes.- What is the moment arm?o Perpendicular force- When torque is counterclockwise, is the rotation positive or negative?o Positive- Does the center of mass need to be on an object?o No (think of a float).Lecture 9 (September 24)- Primarily classroom response questions. No new material introduced.Lecture 10 (September 29)- Define kinetic energy.o Energy of motiono Denoted as K.- For equal speeds, how does K vary with mass?o Proportionally- For equal masses, how does K vary with velocity?o Proportionally- Is K a scalar or vector quantity?o Scalar- What is the formula for work?o W = F∆X- What is the formula for kinetic energy?o K = ½ mv2Lecture 11 (October 1)- What is the net external work?o When more than one force acts on an objecto Sum of works done by individual forceso Wnet, ext = W1 + W2 + W3 …- How is K related to net external work?o Net external work is the change in kinetic energy- True/False: The work done by a force can be +, -, 0.o True, it depends on the angle between the force and displacement.- What is the formula for net external work?o Wnet, ext = ∆K = ½ m(v2f – v2i)Lecture 12 (October 6)- In the ball-Earth system, what if there are no external forces?o No work is done on the systemo Total energy remains the same- What is the formula for gravitational potential energy?o Wgrav = -∆Ugrav- When ∆K = -, ∆E = 0, ∆U = ?o +Lecture 13 (October 8)- What is the relationship between the spring extension and the applied force?o Proportionally- What is the formula for applied force?o Fapplied = k*∆lo Force constant = k- What is the direction of the spring force compared to the applied force?o Opposite direction- What is the magnitude of the spring force compared to the applied force?o Equal- What is the formula for the spring force?o Fspring = -k*∆l- What is the formula for the elastic potential energy of a spring?o Uelastic = ½ k(∆l)2Lecture 13 (October 13)- Does gravity have external forces?o No external forces = no worko Total energy must remain constant- When the ball rises, the kinetic energy decreases, and the total energy?o stays the same- Gravitational Potential Energy increases when KE?o decreaseso Increases when kinetic energy decreases - W = ?o -deltaULecture 14 (October 15)- The potential energy of the ball-Earth system is proportional to?o the ball’s vertical position- Chemical Bonds are?o The attraction between two opposite electric charges is similar to the attraction of two massesLecture 15 (October 20)- Thermal energy equation?o Eth = Umicro + Kmicro- Range of K temperature?o 0 to 373- First Law of Thermodynamics?o Energy can be transferred between the system and environment through a thermal interactiono W + Q = Delta E- Specific heat equation?o c=Q/(M * deltaT)- Ideal Gas Law?o pV= nRT- Zeroth Law of Thermodynamics?o Two systems placed will transfer thermal energy from hot to cold until equilibriumLecture 16 (October 22)- One mole of any substance


View Full Document

UNC-Chapel Hill PHYS 104 - Final Exam Study Guide

Download Final Exam Study Guide
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Final Exam Study Guide and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Final Exam Study Guide 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?