Lecture 7 - Linear Kinematics Flashcards
what is needed for position
a reference frame
what is position and what is the symbol for it
position is a vector and the symbol is s
what does position tell you
where you are to the origin of your point of interest
how are vectors written
in bold or sometimes they have an arrow over the top
distance and displacement are both
descriptions of change in position
distance is a …
scalar
distance tells us
the length of path (like if you stretched out the path and measured the full distance travelled)
what is the symbol for distance
d (not in bold as it is a scalar)
displacement is a …
vector
displacement tells us
difference between initial and finial position
what is the symbol for displacement
d (in bold as it is a vector)
what is the equation of displacement
displacement (bold d) = change in position (s) = sf - si
what is the slope on rate of change graph equal to
rise / run
speed is a …
scalar
speed tells us the
rate of change in distance
equation of speed
v = d / change in time
speed = distance / change in time
velocity is a …
vector
velocity tells us
the rate of change in position
what is the equation of velocity
bold v = bold d / change in time
velocity = displacement / change in time
what is the expanded version of the velocity equation
(final position - initial position) / (final time - initial time)
a positive slope on a distance graph would mean what for velocity
positive velocity
a constant slope on distance graph would mean what for velocity
constant velocity
an increasing slope on distance graph means what for velocity
increasing velocity
speeding up and slowing down doesnt ….. so that means it is a
doesn’t have any reference to direction therefore is a scalar
speeding up and slowing down tells us
rate of change of speed
what is the equation of speeding up / slowing down
a = change in speed / change in time
v is not bold because it is speed not velocity
acceleration is a …
vector
acceleration tell us
rate of change of velocity
what is the equation of acceleration
a in bold = change of v in bold / change in time
acceleration = change in velocity / change in time
a positive velocity slope on graph means what for acceleration
positive acceleration
a constant velocity slope means what for acceleration
constant acceleration
an increasing velocity slope means what for acceleration
increasing acceleration
is someone is slowing down in the positive direction what will their direction of motion be, their change in motion and acceleration
positive direction of motion
negative change in motion
negative acceleration
direction is indicated in
vectors
direction is not indicated in
scalars
speed, velocity and acceleration involve
rate of change
