# Shared Flashcard Set

## Details

Unit 16
Nonlinear and Rotational Motion
22
Physics
04/07/2013

Term
 Nonlinear motion
Definition
 Motion in a curved path
Term
 What is usually the reference point?
Definition
 The Earth
Term
 What kind of quantity is velocity?
Definition
 Vector
Term
 What represents vectors?
Definition
 Arrows
Term
 How do we combine vectors?
Definition
 Parallel in same: add Parallel in opposite: subtract Side wind: Distance formula
Term
 Linear speed
Definition
 Distance moved per unit of time
Term
 Rotational speed
Definition
 # of rotations per unit of time
Term
 Rotational speed is always ___________ in the same object
Definition
 The same
Term
 What is the unit of rotational speed?
Definition
 RPM (Revelutions Per Minute)
Term
 Rotational inertia
Definition
 Property of an object to resist a change in rotational states of motion
Term
 Torque
Definition
 Force applied at some distance to the axis of rotation
Term
 Lever arm
Definition
 Distance from the axis of rotation to where the torque is applied
Term
 What is the equation for torque?
Definition
 Torque = lever arm x force
Term
 Center of mass
Definition
 Avarage position of mass in an object
Term
 Center of gravity
Definition
 Avarage position of wieght
Term
 Why are COM and COG practicly the same thing?
Definition
 Wieght and mass are directly proportional
Term
 How do you determine the COG?
Definition
 Suspend an object from a string and draw a vertical line downward from the point of suspension Suspend the object from another point and repeat The COG is where the two lines intersect
Term
 How can the COG be at a point where no mass exists?
Definition
 With a donut or ring shape [image]
Term
 What makes an object more stable?
Definition
 Wide base ans low COG
Term
 What is the equation for angular momentum?
Definition
 Angular mom = mvr   m=mass v=velocity r=radial distance
Term
 What is the Law of Conservation of Angular Momentum?
Definition
 AM is conserved
Term
 Why does a spinning figure skater speed up when bringing his/her arms in?
Definition
 AM=mvr   Bringing arms in shortens radial distance, since mass cant change, and AM is conserved, velocity increases
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