Term
Define and give units of speed 

Definition
speed is how fast, distance/time, units m/s or cm/s 


Term
Define and give units of instantaneous speed, velocity, acceleration 

Definition
its the speed, velocity, or acceleration at an insant, units still m/s, m/s, and m/s^2 


Term
Define and give units of velocity 

Definition
it is how fast with direction, vector quantity, units m/s 


Term
Define and give units of acceleration 

Definition
its the change in velocity/change in time, units m/s^2 


Term
Define and give units of distance 

Definition
speedxtime, scalar quantity, units m 


Term
Define and give units of displacement 

Definition
how far relative to a starting position, change in x, units m 


Term
Define and give units of density 

Definition
mass/volume, units kg/m^3 


Term
describe the physics of a set of keys thrown straight upward 

Definition
the keys are thrown up with an initial velocity, the gravitational force (acceleration due to gravity) slows the keys down, where ttop=v(subnot)/g, then the keys speed back up as they fall down and strike the hand with the same speed that they left the hand. 


Term
How far objects move dropped from rest in free fall 

Definition
∆y=v(subnot)t1/2gt^2
an object moves a distance ∆y in free fall, which is equal to the initial velocity times time subtracted from half of the the gravitational constant times time squared. 


Term
How fast objects move dropped from rest in free fall 

Definition
either equation v=v(subnot)gt or v^2=v(subnot)^22g∆y
Both equations can determine how fast, the first equation is how fast in regards to initial velocity subtracted by the gravitational constant times time
The second equation is the initial velocity squared subtracted by 2 times the graviational constant times ∆y 


Term
Compare and contrast scalars and vectors 

Definition
Both scalars and vectors are quantities with magnitude, but only vectors are quantities with magnitude and direction. 


Term
Examples of scalars and vectors 

Definition
Scalars= temp, speed, distance, mass
Vectors= force, velocity, acceleration, displacement 


Term
What objects of a car cause acceleration? 

Definition
Gas pedal, brakes, steering wheel, tires, etcall are accelerators because they change speed or direction
Acceleration is a vector quantity 


Term
Speedomoter or velocitomer in the car's dashboard? 

Definition
Speedomoter because it only gives magnitude, not direction, scalar quantity 


Term
Define and give examples of proportional 

Definition
technique for comparing quantities, if quantity A increases, then quantity B also increases
distance α time amnount of water in the tub α time water running Circumfrence α diameter 


Term
Define and give examples of inversely proportional 

Definition
if quantity A increases, then quantity B decreases at the same rate
P α 1/V Money in your acct α 1/checks you write 


Term
What kinematic parameters are changing when an ojbect is in free fall dropped from rest? 

Definition
Time, velocity, displacement, NOT Acceleration 


Term
Acceleration due to gravity 

Definition
Any freefalling object is falling under the influence of gravity. All free falling objects dropped from rest accelerate at 9.8m/s^2 


Term
A box has volume 75 cubic inches, convert to cubic meters and centimeters 

Definition


Term
Compare d=st and d=(1/2)gt^2 

Definition
first equation is scalar, finding distance only with magnitude
second equation is finding distance with acceleration, which makes it a vector quantity 


Term
After 2 seconds, a freely falling objects will have a speed of ?? and have dropped ?? m 

Definition
v=v(subnot)gt =0(9.8)(2) =19.6m/s
∆y=v(subnot)t1/2gt^2 =(0)(2)1/2(9.8)(2)^2 =17.6m 


Term
discuss the three kinematic formulas 

Definition
v=v(subnot)+at
∆x=v(subnot)+1/2at^2
v^2v(subnot)2=2a∆x
The first equation come about by the defn of acceleration and can be used to solve for any of the variables
The second equation is a substitution of v into a ∆x equation so that there is no v
The third equation is a substitution into the previous equation for t so that there is no time variable 

