Term

Definition
the study of motion and physical concepts such as force and mass 


Term

Definition
this is the part of dynamics that describes motion without regard to its cause 


Term
what is the geocentric model 

Definition
this theory regarded Earth as the center of the universe 


Term
what is the heliocentric model 

Definition
this theory states that Earth and other planets revolve in circular orbits around the sun 


Term
what is a frame of reference 

Definition
this is a choice of coordinate axes that defines the starting point for measuring any quanity, an essential first step in solving any problem in mechanics 


Term

Definition
this is defined as its change in position and given by: delta x 


Term
what is a vector and give three examples of vector quantities 

Definition
a vector quantity is characterized by having both direction and magnitude. three examples of vector quantities are displacement, velocity, & acceleration 


Term
what is average speed and how do you find it 

Definition
is the length of the path it travels divided by the total elapsed time 


Term
what is average velocity and how do you find it 

Definition
it is a vector quantity, having both magnitude and a direction. to find average velocity, take the change in displacement and divide it by the change in time 


Term
what ia a position vs. time graph 

Definition
this a graphical interpretation of velocity 


Term
how can you determine the average velocity of a position vs. time graph when the slope is not linear 

Definition
the average velocity of an object during the interval delta t, is equal to the slope of the straight line joining the inital and final points on a graph of the objects position vs. time. 


Term
what is instantaneous velocity 

Definition
this is the speed of your car and the direction it was going at a particular instant in time 


Term
how can you find the instantaneous velocity at any time 

Definition
take the slope of the line tangent to the position vs. time curve 


Term
how is instantaneous velocity different than instantaneous speed 

Definition
instantaneous speed doesnt carry an algebraic sign, for example: +/ 15 m/s is an instantaneous velocity, whereas, 15 m/s is an instantaneous speed
in other words, instantaneous speed is scalar 


Term

Definition
this is the change of an object's velocity with regards to time 


Term
when an objects velocity and acceleration are in the same direction, what happens to speed 

Definition
speed increases over time 


Term
when an objects velocity and direction move in opposite directions, what happens to speed 

Definition
speed decreases over time 


Term
what is instantaneous acceleration 

Definition
this is the limit of the average acceleration as the time interval goes to zero 


Term
what can you find from a velocity vs. time graph 

Definition
one can find the average acceleration by taking the delta v divided by the delta t 


Term
how can you find the instantaneous acceleration on a velocity vs. time graph 

Definition
take the slope of the tangent to the velocity vs. time graph at that time 


Term

Definition
a representation of a moving object at successive time intervals, with velocity and acceleration vectors sketched at each position 


Term
when an object moves with constant acceleration, the instantaneous acceleration at any point in a time interval is 

Definition
equal to the value of the average acceleration over the entire time interval 


Term
what does the area under a velocity vs. time graph always equal 

Definition
it always equals the displacement of the object 


Term
what is a free falling object 

Definition
any object moving freely under the influence of gravity alone, regardless of its initial motion 


Term
how do we denote the magnitude of free falling acceleration 

Definition

