# UWEC PHYS 211 - Exam 1 Study Guide (6 pages)

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## Exam 1 Study Guide

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trigonometry, kinematics, kinematic equations, motion in two dimensions, projectile motion, free fall, gravity, unit conversions, significant figures, vectors, velocity, acceleration

- Pages:
- 6
- Type:
- Study Guide
- School:
- University of Wisconsin-Eau Claire
- Course:
- Phys 211 - General Physics

**Unformatted text preview: **

PHYS 211 Exam 1 Study Guide Lectures 1 7 Lecture 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 Units Mass gram Length meter Volume liter Time second Unit Conversions Example 1 Example 2 The 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 635 000 Lecture 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 problem Example 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 m Division 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 8 Lecture 3 Kinematics Description of Motion Scalar Quantities have no direction distance and speed are scalar quantities Average Speed measures the total distance divided by the total time PHYS 211 Instantaneous speed the speed measured at a given time such as on a speedometer Vector quantity has magnitude AND direction Displacement a vector between the initial position to the final position of an object Average velocity displacement divided by time Lecture 4 Average acceleration the average rate at which velocity changes Lecture 5 Kinematic Equations when Acceleration is Constant PHYS 211 Free Fall An object in free fall has a constant downward acceleration of 9 8m s Lecture 6 Vectors Lecture 7 Components of Motion PHYS 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 SEPERATELY

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