Phys 104Exam # 1 Study Guide Lectures: 1 - 6Lecture 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