Lecture 18 - The Impulse Momentum Relationship Flashcards
what is inertia
is the observed natural tendency of an object in motion to keep moving in the same direction and at the same speed or if at rest, to stay at rest
inerta =
resistance to change in motion state
what is L
momentum
what is momentum equal to
momentum (L) = mass x velocity
a heavy object travelling fast will have a ….. momentum than a light object travelling at the same speed
greater momentum
change in velocity causes an object to
accelerate or decelerate
the magnitude of acceleration or deceleration is proportional to the
to the net force acting on the object and inversely proportional to the mass
in the basic Tennent of Mechanics (sum of forces = mass x acceleration), acceleration is directly proportional….
proportional to and in the same direction as net force
what is the impulse momentum equation
Ft = mVfinal - mVinital
what part of the impulse momentum equation is impulse
the first part (Ft)
what part of the impulse momentum equation is momentum
the second part (mVfinal - mVinital)
equation of how we change the state of motion of a system
impulse of net external forces exerted on the system = change in momentum of the system
- there is an equation i can’t copy in the lecture slides
impulse is = to what area
the area under the force curve
in order to change our momentum we need to apply a force to change direction, this is
initial momentum we have, plus whatever we push adds to the magnitude of our change
the person who is most successful in change in direction will
the person who loses the least momentum
momentum describes the quantity
of motion a mass has based on its velocity
what do anterior and posterior forces tell us when walking
propulsion and breaking forces
if our momentum isn’t changing, this tells us the net impulse is
0
if the net impulse is 0
anterior and posterior impulse have to be equal and opposite
what does the net impulse have to be if we are increasing our momentum
net impulse has to be positive because that will give you a positive change in momentum
if we are decreasing velocity what will the net impulse be
negative cause we have to take away from our initial momentum, that would be increasing breaking impulse
when velocity is the important performance outcome, we can maximise performance by maximising
GRF
