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OCR A level physics
Module 3 - Forces and motion
3.1 - Motion
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Cards (13)
Acceleration
The rate of
change
of
velocity.
Average speed
Distance over time
for the
entire region
of
interest
Braking distance
The distance
travelled
between the
brakes
being
applied
and the vehicle coming to a
stop.
It is affected by the vehicle and
road conditions.
Displacement
The
direct distance
between an object's
starting
and
ending positions.
It is a
vector quantity
and so has both a
direction
and a
magnitude
Displacement-Time Graphs:
Plots showing how
displacement changes
over a
period
of
time.
The
gradient
gives the
velocity.
Curved lines represent an acceleration.
Free fall
An object is said to be in
free fall
when the only force acting on it is the force of
gravity.
Instantaneous Speed
:
The
exact speed
of an object at a
specific
given
point
Reaction Time
:
The time taken to process a
stimulus
and trigger a
response
to it It is affected by
alcohol
,
drugs
and
tiredness
,
Stopping Distance:
The
sum
of
thinking distance
and
braking distance
for a
driven vehicle
Thinking Distance
:
The distance travelled in the time it takes for the driver to react. It is affected by alcohol, drugs and tiredness.
Velocity-Time Graphs:
Plots showing how
velocity
changes
over a
period
of
time
the
gradient
gives
acceleration.
Curved lines represent changing acceleration.
Velocity:
The rate of change of displacement. It is a vector quantity and so has both a direction and a magnitude.
Parabolic motion
Is where an object has
constant velocity
in one direction and
constant acceleration
in a
perpendicular
direction
