Term

Definition
Study of
• Energy
• Force
• Motion 


Term

Definition
Change in position of object 


Term
Motion  What is needed to describe 

Definition
• Direction
• How Fast
• Location at given time 


Term
Frame of Reference  Definition 

Definition
System of objects that are not moving with respect to one another
How fast something moves is relative to the "frame of reference" chosen 


Term
Frame of Reference  What is most commonly used? 

Definition


Term

Definition
Motion in relation to a frame of reference
Example: moving train
• Platform as frame of reference  train moves by
• Inside the train as frame of reference  people not moving 


Term

Definition
Frame of reference and relative motion as the reason
• Eyes = you travelling at high speed
•Inner Ears = you're sitting still
Mismatch of info makes people sick
Stare at horizon to calm things down 


Term

Definition
Length of path between two points (like line segment length
SI Units = meters (m)
Large = kilometer (1 km = 1000 m)
Small = centimeter (1 cm = 1/100 m) 


Term

Definition
Ratio: Distance to time
Speed = distance / time
Units = meters / second = m/s
Scalar measure (single number) 


Term

Definition
Total distance / total time
e.g. trip to New York
300 miles
4 hours
average speed = 300 miles / 4 hours = 75 mph 


Term

Definition
Speed at a given instant
e.g.  Speedometer reading 


Term

Definition
On distance vs. time plot
It is the slope of the plot
• steeper slope = faster movement
• zero slope = standing still
• negative slope = moving backwards 


Term

Definition
• Vector measurement
Speed and Direction
Change in velocity comes from change speed, direction or both 


Term

Definition
Rate that velocity changes
Acceleration = change in velocity / time
SI units = (meters / second) / seconds =
meters / second^{2} = m/s^{2} 


Term

Definition
Change in velocity / time
Results from:
• Change in speed
• Change in direction
• Both 


Term

Definition
Velocity changes constantly with time
Plot of velocity vs. time = straight line
Plot of distance vs. time = parabola (t_{2}) 


Term
Example of constant acceleration 

Definition
Acceleration due to gravity = 9.8 m / s^{2} 


Term

Definition
Acceleragtion = change in velocity / time
= (V_{f}  V_{i}) / time
Units: (m/s) / s = m/s^{2}
Don't forget to show work and to show units 

