# UNC-Chapel Hill PHYS 104 - Final Exam Study Guide (12 pages)

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## Final Exam Study Guide

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- Pages:
- 12
- Type:
- Study Guide
- School:
- University of North Carolina at Chapel Hill
- Course:
- Phys 104 - General Physics I
- Edition:
- 1

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Phys 104 Final Study Guide Lecture 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 r 3 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 volume Lecture 2 August 27 What functions of a graph should you consider when determining best fit quadratic linear exponential power Power Laws Know 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 kg Lecture 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 law Lecture 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 time Small objects experience small changes in large amounts of time Purpose of position vs time graph Object is either speeding up or slowing down Purpose of velocity vs time graph Acceleration slope Newton s 2nd Law Equation Fnet m a Lecture 5 September 10 Gravitation force features non contact forces magnitude of mg points towards earth Formula Fgrav mg Lecture 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 Proportional Lecture 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 strength Lecture 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 force o Position of force o 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 motion o 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 mv2 Lecture 11 October 1 What is the net external work o When more than one force acts on an object o Sum of works done by individual forces o 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 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 system o 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 l o 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 k l 2 Lecture 13 October 13 Does gravity have external forces o No external forces no work o 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 decreases o Increases when kinetic energy decreases W o deltaU Lecture 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 masses Lecture 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 interaction o 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 equilibrium Lecture 16 October 22 One mole of any substance contains o 6 10 23 mol 1 K o mv2 Adiabatic processes are o When heat is not transferred Second Law of Thermodynamics entropy does what o Entropy never decreases Entropy equation o S k ln W Lecture 17 October 27 The velocity of an object is a quantity o Vector Velocity points in …

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