Save
Physics 1
Forces and Motion
Save
Share
Learn
Content
Leaderboard
Share
Learn
Created by
Lylah Hulston
Visit profile
Cards (32)
A vector has
direction
and
magnitude
Examples of vectors -
velocity
,
displacement
,
acceleration
,
Momentum
,
force
A
scalar
has a
magnitude
and
no direction
Examples of
scalars
-
speed
,
distance
,
time
,
mass
,
energy
Displacement time graphs -
Gradient is
velocity
Curved line means the
velocity
is
changing
(
acceleration
)
Horizontal line means
stationary
displacement
is the change in an objects
position
Velocity time graphs -
Gradient is
acceleration
Curved line means that
acceleration
is
changing
Horizontal time means
constant
speed
Area under line means distance
travelled
Speed
=
distance
Time
Constant speed -
Measure distance
traveled
Use
stopwatch
for time taken
Newton’s first law -
An object has a
constant velocity
unless acted on by a
resultant force
Newton’s second law -
Force
=
mass
x
acceleration
Weight =
mass
x
gravitational field energy
Circular motion -
An object is moving in a
circle
at a
constant
speed
Speed is
constant
but
direction
is changing which means it’s
accelerating
A
centripetal
force is any force which acts
towards
the centre of a
circle.
Internal mass
is a measure of how different it is to change the
velocity
of an object
Internal mass =
force
Acceleration
Newton’s third law -
when
two
objects
interact,
their
forces
on each other are
equal
and
opposite
Momentum
=
mass
x
velocity
Momentum
is
conserved
during
collisions
meaning it is the same
before
and
after
Force
= change in
momentum
Time
Human reaction time
-
There is a delay between when someone sees and acts
Average rate of reaction is
0.25
seconds
Stopping distance =
thinking
distance
breaking
distance
Thinking distance can be affected by influence of
drugs
or
alcohol,
tiredness
or
distractions
Braking
distance can be affected by road
conditions
,
speed
or
mass
During a crash there is a large
deceleration
over a
short
period of time which means a
greater
force is exerted and able to
injure
Work done
is the
energy
transferred by a
force
acting over a
distance.
Work done
=
force
x
displacement
(
energy
transferred )
Weight
is the force acting on an object due to
gravity
Velocity
is the rate of change of
displacement
Speed
is the
rate
of
change
of
distance
Kinetic energy =
0.5
x
mass
x
speed2
Safety within cars -
seatbelt
,
airbag
,
crumple
zone