# Shared Flashcard Set

## Details

Translational Motion
flashcards for Examcracker's MCAT physics
19
Physics
Undergraduate 3
12/24/2014

## Cards Return to Set Details

Term
 Scalar
Definition
 Physical quantity that has magnitude but no direction
Term
 Vector
Definition
 Physical quantity with both magnitude and direction; can be represented by an arrow
Term
 How do you add vectors? Subtract? What about scalars with vectors?
Definition
 -Place head of first to the tail of the second, then draw an arrow head to tail (resulting vector); magnitude of 2 vectors must be smaller than or equal to sum of result -for subtract, flip one of the vectors (make it go in the negative direction) and do the same thing; must be greater than or equal to resulting difference vector -Cannot add or subtract; but can multiply or divide by scalrs
Term
 How to multiply vector? Vector x scalar?
Definition
 Vector x vector: result= perpendicular to both tails together; V1V2sintheta Vector x scalar: V1V2costheta
Term
 What are component vectors?   Easier way than SOHCAHTOA to find all magnitudes + angles?
Definition
 Each vector can be a "hypotenuse" and have 2 perpendicular "x and y" components equal to it addition wise   O= Hsintheta A=Hcostheta Remember, theta is always between A and H
Term
 Displacement vs distance
Definition
 displacement= distance with added dimension of direction; it's a vector basically the shortest "distance" from point A to Point B; distance= actual pathway
Term
 Average Velocity Instantaneous Velocity Velocity can be either...
Definition
 Average velocity= displacement/time Instantaneous velocity= velocity at any moment during the trip at a specific time Can be either all verticle or all horizontal
Term
 Acceleration Are velocity and acceleration always in the same direction?
Definition
 any change in velocity, in EITHER magnitude or direction velocity and acceleration do not have to be in the same direction; e.g. ball thrown up-> peak, velocity= 0, but acc is still there
Term
 uniformly accelerated motion
Definition
 constant acceleration in terms of magnitude and direction (velocity changes at a constant rate)
Term
 displacement vs time graph (slope, line, area under the curve)
Definition
 slope: instantaneous velocity  at that time range upward slope= positive velocity, downward= negative under 0 line: velocity is going in the *negative direction* Horizontal line= not moving (0 velocity) curved line= changing velocity, thus acceleration area beneath= no meaning
Term
 velocity vs time (slope, line, area under the curve)
Definition
 slope: instaneous acceleration at that specific time range upward= positive acc; downward= negative acc (acceleration in the negative direction) straight line= constant acc; curved= changing acc; flat line= no change in acc, constant velocity   area under: displacement
Term
 How to solve linear motion problems
Definition
 -Draw line with initial and final velocity; center= average velocity **acc is constant D= average vel * time acc= time * (difference between the two velocities)
Term
 How to look at projectile motion problems
Definition
 Horizontal component seperate from verticle (both linear motion problems
Term
 Projectile motions: describe velocity in the beginning
Definition
 Angle "theta", initial velocity = vsintheta, horizontal velocity= vcostheta always
Term
 Projectile motions: what happens at the peak? equation for peak height?
Definition
 height "h"= heighest since it's the peak; g= +10 m/s^2 (since there's now downward acceleration) always; no verticle velocity equation: vsintheta = sqroot(2gh)
Term
 In projectile motion: what determines time of flight?
Definition
 initial velocity
Term
 What is drag
Definition
 this occurs when an object moves past a nonideal gas or liquid...fluid molecules drag past this object and act to impede the object's motions
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