Momentum - Harrison High School
Transcript Momentum - Harrison High School
What is Momentum?
Momentum: ___________ in motion
Momentum= Mass x Velocity
____________ = Mass x Speed – when direction is
not an important factor
Unit: kg x m/s
The more __________ an object has, the more
__________ there is possible.
Speed affects the momentum of an object.
EX. A fast car can have more momentum than a slow truck
w/ greater mass
Non-moving objects have no momentum at all.
Impulse Changes Momentum
If ____________ changes,
then either mass or velocity
or both has changed.
If mass is unchanged and
the ___________ changes
then acceleration results.
Accelerations are produced
The greater the force=
______ an objects change
in velocity = Greater
change in momentum.
The quantity force X time
interval = Impulse
F(delta t) = Impulse
The greater the impulse on an
object, the greater the
_____________ in momentum
Impulse = _____________ in
Impulse = Ft = delta (mv)
t is the time interval (delta t)
Unit = Ns
Apply greatest force possible for as long as possible.
EX. Baseball player and Golfer swinging as hard as possible
and following through with their swings.
Forces involved in impulses usually vary from ________
EX. The force is zero on a golf ball until it is struck by
the club; then the force increases rapidly as the ball’s
shape becomes distorted. The force decreases as the
ball returns to its original shape and increases in speed
_________________= Avg. force of impact measured in
__________________ = Impact Force x time measured
in Newton seconds
The same impulse decreases your momentum
whether hitting a wall or haystack
The same impulse does ______ mean with the
same force or time.
The product of the force and time are the samenot necessarily the force and time.
Impact time is ______________ when you hit the
haystack rather than the wall.
Impact time = the time during which your
momentum is brought to _________.
The ___________ the impact time = reduction in
force of impact = reduction in deceleration
EX of things that increase impact time and therefore
decrease impact force
Padded dashboard v. rigid dashboard
Bending your knees when you jump from an elevated
Relaxing your body when you fall to spread force of impact
over more muscles
Falling on a soft mat vs. hard floor
Moving away from a punch
EX. Increasing the time of impact 100 times reduces
force of impact 100 times.
Impact force and impact time are ___________
proportional.(Two variables that affect impulse)
Conservation of Momentum
To accelerate an object, a ______ force must
be applied to the object.
To change the momentum of an object, you
must __________ an impulse on it.
If no net force or net impulse acts on a system,
the __________ of that system cannot change.
The Law of Conservation of Momentum: In the
absence of an external force, the momentum of
a system remains unchanged.
Elastic Collisions: When objects collide
___________ being permanently
deformed and without generating heat.
Perfectly elastic collisions are not
common in the everyday world- some
__________ is produced in the collisions.
Inelastic Collisions: objects collide and
become __________ or ___________
together generating heat and becoming
____________ in the process.
Most collisions usually involve some