comprehensive final info Flashcards
a body will remain at rest or continue to move with a constant speed in a straight line unless acted upon by an outside force
newtons first law
Law of acceleration
F=ma
newtons 2nd law
for every force, there is an equal and opposite reaction force
newtons 3rd law
what is the revised newtons 2nd law
F= mv/t
formula for impuse
force x time
______ is equal to change in momentum
Impulse
FAR or RAF
1st class lever
ARF OR FRA
second class lever
AFR or RFA
3rd class lever
lever that can do all four functions
1st class lever
favors speed and ROM
3rd class lever
favors force production
2nd class lever
Resistance lever arm is always longer
3rd class lever
force moment arm is always longer
2nd class lever
examples of 1st class levers in body
neck extension
elbow extension
examples of 2nd class levers in body
push up
toe raises
examples of 3rd class levers
elbow flexion
knee extend and flex
shoulder extend and flex
hip extend and flex
most common type of lever in the body
3rd class lever
angular impulse formula
impulse = torque x time
angular impulse is equal to ______
angular momentum (H)
regardless of stance, the ______ cannot be located outside the _______ to maintain balance
COP
BOS
the state of matter that makes things change, or has the potential to make things change
energy
the energy that a body has due to its motion
kinetic energy
the energy a body has that has the potential to change something but is not currently changing anything
potential energy
formula for kinetic energy
KE= 1/2 mv squared
the potential energy that a body has due to its position
gravitational potential energy
the energy a body has due to its deformatin
strain potential energy
the process of changing the amount of energy in a system
work
formula for work
w= F x d
_____ work means that the energy is entering the system
postive
______ work means that the energy is leaving the system
negative
at the top of a jump (apex), ________ = 0
kinetic energy
as you go down, ______ energy is changed to ______ energy
potential energy is changed to kinetic energy
- the time rate of doing work
- how energy is leaving the system
- how much force can be produced while moving quickly
power
formula for power
power= work/ time (W)
the turing effect of a force
Torque (T) or moment of force (M)
formula for torque
T= moment arm x force
formula for the angular equivalent of newtons 2nd law
T= moment of inertia x angular acceleration
resistance to change in motion, specifically a resistance to change in body’s velocity
inertia
resistance to change in a moving object
L=mv
Momentum
angular equivalent of mass; how hard it is to rotate something I=mk(squared)
moment of inerita
angular momentum formula
H= moment of inertia x angular velocity
the study of motion w/o considering what is causing the motion (the geometry of motion)
kinematics
a change in position
- measured as a length of the differences in position between two instances in time
- vector
displacement (delta p)
how far a body has traveled
- measured as the actual length of the route the body took to change its position
- scalar
distance (d)
where an object is located in a frame of reference
postion
how fast a body is moving with no regard to direction
scalar
speed (s)
how fast a body is moving in a particular direction
- change in postion/ change in time
- vector
velocity
how rapidly something is changing velocity
- how fast something is speeding up or slowing down
- vector
acceleration
if a person is running in the + x direction and they have a + velocity and a + acceleration, this indicates they are
speeding up
if a person is running in the + x direction and they have a + velocity and a - acceleration, this indicates they are
slowing down
