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31 Cards in this Set
- Front
- Back
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Model
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analogy/mental image of phenomena to give approx. mental/virtual picture when we can't see what's happening
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Theory
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gives quantitatively testable predictions
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Law
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concise/general statement about how nature behaves
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Principle
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used for less general statements
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magnitude
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specified by a number and unit
ex) 20ft |
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System of Units
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1. SI : has base quantities/derived quantities
base 10 2. English System of Units: ft./lb./sec./slug |
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precision
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5.2 +/- 0.1cm
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% uncertainty
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5.2 +/- 0.1cm
.1/5.2 x 100=?2% |
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significant figures
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digits that are known w/ certainty, plus one that is uncertain
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derived quantities
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combo fundamental quantities
speed= [L]/[t] |
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mechanics
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study of motion of objects and related concepts of force/energy
1.kinematics 2.dynamics |
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kinematics
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describes how objects move
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dynamics
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analyzes cause of motion
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motion
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translation
rotation translation and rotation |
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scalar quantities
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specified completely by its magnitude
ex) speed/distance |
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vector quantities
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completely specified by magnitude and direction
ex) force/displacement/ velocity/acceleration |
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distance
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total path length traveled in moving from one location to another
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speed
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rate at which an object is moving
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average speed
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distance traveled along path divided by time taken to travel distance
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magnitude of 1 dimensional displacement is
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equal between initial/final distance but can be negative or positive
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velocity
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how fast an object is moving and which direction
displacement divided by time elapsed |
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uniform motion in 1 dim
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motion w/ constant velocity/magnitude/direction
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slope of graph position vs. time
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is velocity of object
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acceleration
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change in velocity divided by the time elapsed
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slope of graph velocity vs. time
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acceleration
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free fall
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motion of object if only force applied to the object is its own weight
*objects in motion solely under influence of gravity |
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terminal velocity
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max velocity when falling
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Resolving vector into components
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process of finding vector compoents
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projectile
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any object w/o moving power that is given an initial velocity
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trajectory
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path followed by projectile
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displacement
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straight line distance between two points, along with the "direction" from the starting point to the final position.
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