Term
A frame of refernce is necessary to...


Definition
to describe motion accurately and completely 


Term

Definition
a system of objects that are not moving with respect to another 


Term

Definition
Relative motionmovement in relation to a frame of reference 


Term

Definition
length of a path between two points  When object moves in straight line, distance is length of line connecting object’s starting point and ending point



Term
What is the SI unit for measuring distance? 

Definition
meters(m)  Very large distanceskilometers(km)
 Distances smaller than metercentimeters(cm)



Term

Definition
direction from starting point and length of straight line from starting point to ending point  Displacements sometimes used when giving directions.



Term

Definition
quantity that has magnitude and direction 


Term

Definition
combining of vector magnitudes and directions. *Add displacements using vector addition 


Term
You add two displacements, represented by vectors when they have ____ direction 

Definition


Term
You subtract two magnitudes, when they are in ____ direction 

Definition


Term
When two or more displacement vectors have different directions, they may be combined by 

Definition


Term

Definition
vector sum of two or more vectors 


Term

Definition
a. ratio of distance that an object moves to amount of time the object moves 


Term

Definition


Term

Definition
computed for entire duration of trip 


Term

Definition
measured at a particular instant  rate at which object is moving at given moment in time 


Term

Definition
average speed= total distance total time _ v= d t 


Term
distancetime graph is a good way to describe ____ 

Definition


Term
Slope of line on distancetime graph is the _____ 

Definition
speed *Steaper slope on distancetime graph indicates higher speed 


Term

Definition
speed and direction in which an object is moving 


Term
two or more velocities add by vector ___ 

Definition


Term

Definition
rate at which velocity changes  Acceleration can be described as changes in speed, changes in direction, or changes in both



Term
Acceleration applies to any change in object’s _____


Definition


Term

Definition
movement of an object toward Earth solely because of gravity 


Term

Definition
meters per second per second(m/s_{2}^{2}) 


Term

Definition
9.8 meters per second squared(9.8 m/s2) > ~ 10 m/s2 


Term
You can still accelerate when speed is _____ 

Definition


Term
Sometimes motion is characterized by changes in both _____ and _____ at the same time 

Definition


Term

Definition
steady change in velocity 


Term
Velocity of an object moving in a straight line changes at a _______ when the object is experiencing constant acceleration. 

Definition


Term
You calculate acceleration for a straightline motion by... 

Definition
diving change in velocity by total time 


Term

Definition
average acceleration=change in velocity total time _ a=Vf=Vi t 


Term
If motion is in straight line, velocity can be treated as___ 

Definition


Term
The slope of speedtime graph is the: 

Definition


Term
Constant acceleration represented on speedtime graph by 

Definition


Term

Definition
displayed data form straightline parts 


Term
Accelerated motion is represented by a ___ line on distancetime graph 

Definition


Term

Definition
curve connects plotted data points 


Term
instantaneous acceleration 

Definition
how fast a velocity is changing at a specific instant. 

