871954
Description
physics-motion
- distance time graphs
- we can use graphs to
help us describe the
motion of an object
- a distance time graph
shows the distance of
a object from a
starting point against
the time taken
- the speed of a
object is the
distance
traveled each
second
- the gradient on a
distance-time graph
shows the speed.
the steeper the
gradient the greater
the speed
- if a object is
stationary the
line on the
distance will be
horizontal
- if an object is moving at
a constant speed the line
on the distance-time
graph will be represented
as a strait line that
slopes upwards
- we can calculate
the speed of an
object by using a
simple equation
- speedm/s=distance traveled in metres/
time taken in seconds
- speedm/s=distance traveled in metres/
time taken in seconds
- distance-time graphs are to
do with speed NOT
acceleration
- we can use graphs to
help us describe the
motion of an object
- more about velocity time graphs
- a velocity time
graph shows the
velocity of an
object against the
time taken
- the gradient of the line
on a velocity time graph
represents acceleration
- the steeper the
gradient the greater
the acceleration
- if the line on a velocity time graph
is horizontal, the acceleration is
zero. therefore the object is moving
at a constant speed
- if the gradient on the line is
negative then the object is
decelerating
- velocity-time graphs are to do
with acceleration NOT speed
- a velocity time
graph shows the
velocity of an
object against the
time taken
- velocity and acceleration
- the velocity of an object is
its speed in a given direction
- if an object changes
direction it changes
velocity, even if its speed
stays the same
- if the velocity of an
object changes we say
that its accelerating
- we can calculate
acceleration by using
the equation:
- a=v-u/t
- a=v-u/t
- if the value for
accelerationis negative,
the object is
decelerating (slowing
down). deceleration is
the same as negative
acceleration
- where: A is the acceleration in m/s ^2,
V is the final velocity m/s , U is the initial
velocity m/s and T is the time taken s
- the velocity of an object is
its speed in a given direction
- using graphs
- if you calculate the gradient of the
line on a distance time graph you
answer will be the speed of the object
- if you calculate the gradient of the line
on a velocity time graph your answer will
be the acceleration of the object
- calculating the area under the line between two
times on a velocity time graph gives the
distance travelled between those times
- if you calculate the gradient of the
line on a distance time graph you
answer will be the speed of the object
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