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Quiz Review

Quiz Review. The good students will take copious notes. The Topics You Need To Study. Unit Conversions One dimensional Motion Solving for distance Solving for time Solving for velocity Solving for acceleration Vectors Finding magnitude Finding direction. Unit Conversions.

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Quiz Review

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  1. Quiz Review The good students will take copious notes.

  2. The Topics You Need To Study • Unit Conversions • One dimensional Motion • Solving for distance • Solving for time • Solving for velocity • Solving for acceleration • Vectors • Finding magnitude • Finding direction

  3. Unit Conversions • DO NOT WRITE MPH!!! Instead, write miles/hr (this will help you keep from getting confused) • 1600 meters = 1 Mile • 1.6 km = 1 Mile • 3600 Seconds = 1 hr

  4. Unit Conversions cont’d • Remember, when converting units, each section of the picket fence (after the first) must be an equivalency (i.e. 1 mile/1600 m, or 1 hr/3600 sec) • Put the unit you want to cancel OPPOSITE (numerator or denominator) • Example: 25 miles 1600 meters 1 hr 1 hr 3600 sec 1 mile

  5. Distance, Time and Velocity USE THE TRIANGLE! How do we find D? How do we find V? D How do we find T? V T Remember: D = V X T is basically one equation!!

  6. Velocity, Acceleration and Time USE THE TRIANGLE! How do we find V? How do we find A? V How do we find T? A T Remember: V = A X T is basically one equation!!

  7. Missing Time and Missing Velocity • Missing velocity equation: • D = ½ A•T2 • Missing time equation: • Vf2 = Vi2 + 2AD

  8. Strategies • Identify what the question is asking for – look for phrases like • How long…? (answer should be a time in sec or min or hours) • How far…? (answer should be distance in meters or km or miles) • How fast…? (answer should be speed/velocity in m/s or km/h or miles/hr) • What is the acceleration of…? (answer should be an acceleration in m/s2)

  9. Write down known info • Distance = ? • Time = ? • Acceleration = ? • Velocity = ? • “Starts from rest…” → Vi = 0

  10. Identify the completely missing quantity • This will help you identify which of the four basic equations you need. • V = D/T • A = V/T • D = ½ A•T2 • Vf2 = Vi2 + 2AD

  11. Vector Stuff • Remember: find the magnitude (length) of a vector by Pythagorean Theorem • Remember: find the direction (angle) of a vector by Tan-1(ΔY/ ΔX) -- and keep track of final and initial Y and X in case one is negative • Remember: always measure your angle from the Positive X-axis and go COUNTERCLOCKWISE to get a positive angle. Do not use negative angles

  12. Dr. Mason’s Helpful Hints • Remember your units • Understand the difference between velocity and acceleration • Likewise, understand the difference between m/s and m/s2 • Remember: Δanything = final - initial • Beware of writing units we have NEVER used in class. Examples: miles/hour2, m/s3 • Remember what negative acceleration means

  13. Lest we forget… • There is gravity on the moon. Accept it and move on.

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