PHYS 211Exam 1 Study Guide: Lectures 1-7Lecture 1 (September 3rd)Physics attempts to describe nature in an objective way through nature. Measurements are expressed in units, officially accepted units are called standard units.SI Metric UnitsMass: gramLength: meterVolume: literTime: secondUnit ConversionsExample 1Example 2The Queen Elizabeth II travels 15m on a gallon. The distance from Liverpool to New York is 3314 miles. A barrel of oil holds 42 gallons and gas costs $75/barrel. How many gallons with it use? How much will the trip cost?3314 miles(1609m/1mile)(1gallon/15m)=355,480 gallons 355,480 gallons (1 barrel/42 gallons)($75/barrel) = $635,000Lecture 2 (September 4th)Significant Figures Addition and subtraction: round the answer to the LEAST number of places in the decimal portion of any number in the problemExample: 0.33m 25.0 m No decimal places, answer has to have this many sig figs+ 7.2 m 32.53m Final answer is rounded to 33 mDivision and multiplication: the answer is rounded to reflect the least precise measurement. Example: 2.5 Least number of sig figs (least precise) x 3.91 9.775 so the answer is rounded to 9.8Lecture 3Kinematics: Description of MotionScalar Quantities: have no direction, distance and speed are scalar quantitiesAverage Speed: measures the total distance divided by the total timePHYS 211 Instantaneous speed: the speed measured at a given time, such as on a speedometerVector quantity: has magnitude AND directionDisplacement: a vector between the initial position to the final position of an objectAverage velocity: displacement divided by timeLecture 4Average acceleration: the average rate at which velocity changesLecture 5Kinematic Equations when Acceleration is ConstantPHYS 211Free FallAn object in free fall has a constant downward acceleration of -9.8m/s²Lecture 6 VectorsLecture 7Components of MotionPHYS 211 **Cosine does not always apply to the x direction, and sine does not always apply to the y direction** x and y components are calculated SEPERATELYIf acceleration is not parallel to the velocity, the object will move in a curveProjectile MotionPHYS 211 An object projected horizontally has an initial velocity in the horizontal direction, and acceleration (due to gravity) in the vertical direction. The time it takes to reach the ground is the same as if it were simply dropped.A projectile launched in an arbitrary direction may have initial velocity components in both the horizontal and vertical directions, but its acceleration is still