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

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

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 1 hr 3600 sec1 mile 1600 meters

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

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

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/s 2 )

Write down known info Distance = ? Time = ? Acceleration = ? Velocity = ? “Starts from rest…” → V i = 0

Identify the completely missing quantity This will help you identify which of the four basic equations you need. V = D/T A = V/T

Vector Stuff Remember: find the magnitude (length) of a vector by Pythagorean Theorem Pythagorean Theorem : A 2 + B 2 = C 2

Dr. Mason’s Helpful Hints Remember your units Understand the difference between velocity and acceleration Likewise, understand the difference between m/s and m/s 2 Remember: Δanything = final - initial Beware of writing units we have NEVER used in class. Examples: miles/hour 2, m/s 3 Remember what negative acceleration means

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