velo,speed,acc & conversions Flashcards
what is speed?
uniform motion that involves travelling a distance in a specified time
what is the formula for speed? What are the variations?
v = >d
>t
v = average speed
>d = distance travelled
>t = time
to find >d:
>d = v x >t
to find >t:
>t = >d
v
what is uniform motion?
an object that is travelling at a constant rate in a straight line
How does the metric systems work?
is made up of 7 base units (we focus on meters, grams, litres, and Joules)
True or False: physics measures in grams, like chemistry
False! Physics measures in kilograms
what is the process of moving UP a base unit?
divide by the factor shown on the chart (or move the decimal to the left by the # of the exponent)
what is the process of moving DOWN a base unit?
multiply by the factor on the chart (or slide the decimal to the right however many times the # states)
what is the formula for changing the units from seconds to hours? hours to seconds?
seconds to hours: s / 3600
hours to seconds:
hours x 3600s/hour
what is the formula for changing the units from seconds to minutes? minutes to seconds?
seconds to minutes: s / 60
minutes to seconds:
min x 60s/min
what is the formula for changing the units from hours to min? min to hours?
hours to min: hours x 60
min to hours: mins / 60
What is acceleration?
change of velocity over time, vector quantity
What is velocity? What are the two types?
vector: magnitude & direction. indicated by an arrow above symbol ~>V
scalar: magnitude only. how much or how far
What are the two types of acceleration?
- Positive acceleration
-positive magnitude & positive direction (speeding up going north, east, up, or right)
-negative magnitude & negative direction (slowing down going south, west, down, left)
2.Negative acceleration
-positive magnitude & negative direction (speeding up going south, west, down, or left)
-negative magnitude & posture direction (slowing down going north, east, up, or right)
what is the formula for acceleration? what are the variations?
~>a = ~»V
>t
~>a = ~>Vf- ~>Vi
>t
find >t:
>t = ~»V
~>a
find Vf:
Vf = (>t x ~>a) + Vi
find Vi:
Vi = Vf - (>t x ~>a)
True or False:
pos slope=pos acceleration
neg slope=neg acceleration
True!
determine which between distance and displacement are scalar and vector?
distance (>d) = scalar
displacement (-> >d)= vector
determine which out of NESW, and up, down, left & right are positive & negative directions
north & up = pos
east & right = pos
south & down = neg
west & left = neg
what is the formula for velocity? what are the variations?
~>V = ~»d/>t
~>V = velocity
~»d = displacemebt
>t = time
find ~»d:
~»d = ~>V x >t
find >t:
>t = ~»d
~>v
