kinematics Flashcards
kinematics
the concepts needed to describe motion
dynamics
the effect that forces have on motion
scalar
quantities that only describe magnitude
magnitude
how much there is of something
vectors
quantities that describe both magnitude and direction
is 5m scalar or vector?
scalar
is 30m/s, east scalar or vector?
vector
is distance scalar or vector?
scalar
distance
refers to how total ground an object has covered
is displacement scalar or vector?
vector
displacement
refers to how far out of place and object is
-change in objects position
average speed
distance/time
-scalar quantity
-(m/s)
average velocity
displacement/time
-vector quantity
-(m/s)
acceleration
when a change in velocity is combined with the time at which the change occurred
5 kinematic variables
- displacement (x)
- acceleration (a)
- final velocity (v)
- initial velocity (v0)
- time (t)
when not given v0 or t0 assume?
0m/s and 0s
y-axis on distance v. time graph
position(displacement) or distance (m)
x-axis on distance v. time graph
time (s)
on distance v. time graph slope =?
slope = velocity
on a distance v. time graph the steeper the slope?
the faster velocity
on a distance v. time graph when there is no slope?
velocity=0
staying still
positive direction (d v t)
positive slope, moving away (right)
negative direction (d v t)
negative slope, moving towards(left)
constant velocity shown on a distance v. time graph
linear graph
constant acceleration shown on a distance v. time graph
parabola
constant velocity shown on velocity v. time graph
horizontal line
constant acceleration shown on a velocity v. time graph
linear
velocity changes when… (3 things)
- an object speeds up
- an object slows down
- an object changes directions
on a velocity v. time graph you can see an object is slowing down because…
it is headed towards the x-axis
where velocity=0
on velocity v. time graph how can you tell which direction the object is traveling?
if the line is above the x-axis it is traveling away from you (right) , if the line is under the x-axis it is traveling towards you(left)
on a distance v. time graph how can you tell which direction the object is traveling?
positive slope= traveling away from you (right)
negative slope= traveling towards you (left)
When asked what object is ahead or their placement on a velocity v. time graph find the ______ of both and…
displacement of both and the larger displacement= the further away
area under the curve on a velocity vs time graph gives you…
displacement
area under the curve on an acceleration vs time graph gives you…
change in speed (final velocity)
If constant speed is used use what formula…
m/s= m/t
m/s= constant speed
m= distance
an object falling for twice the time will ___ times the distance
4
displacement is proportional to
time squared
with air resistance an object being thrown will have _____ acceleration throughout
the same
free falling acceleration equals..
-9.8m/s2
constant acceleration on a distance vs time graph of an object slowing down will be…
will be a parabola headed towards the x- axis
ln ish
when a distance vs time graph has a negative parabola that means…
positive acceleration in a negative direction
+, +, +
+, -, +
+,+, -
+,-,-
-,+,+
-,-,+
-,+,-
-,-,-
position, velocity, acceleration
right, away, speeding up
right, towards, slowing down
right, away, slowing down
right, towards, speeding up
left, towards, speeding up
left, away, slowing down
left, toward, slowing down
left, away, speeding up
when velocity and acceleration have different signs the object is
slowing down
when velocity and acceleration have the same sign the object is
speeding up
