kinesiology + biomechanics Flashcards
Newtons first law
object at rest or moves at constant momentum unless external force acts upon it
Newton 2nd law
f = m x a
newtons 3rd law
every action has an equal and opposite reaction
LINEAR MOTION
displacement (x)
change in position (x)
m
LINEAR MOTION
MOMENTUM (p)
mass X velocity
kg.m.s-1
LINEAR MOTION
VELOCITY (V)
change in position(x) / change in time(t)
m.s-1
LINEAR MOTION
ACCELERATION (A)
change in velocity(v) / change in time (t)
m.s^2
LINEAR MOTION
FORCE (F)
mass x acceleration
kg.m.s-2 = N
LINEAR MOTION
IMPULSE (IMP)
force X time = change in momentum (p)
kg.m.s-1 = N.s
LINEAR MOTION
KINETIC ENERGY (KE)
1/2 X mass X velocity^2
J
ANGULAR MOTION
Newtons 1st law
an object will stay in constant ANGULAR MOMENTUM unless external TORQUE acts upon it
ANGULAR MOTION
Newtons second law
TORQUE = total moment of inertia x angular acceleration
ANGULAR MOTION
Newtons 3rd law
if first objects exerts torque on second object
second object will react with equal torque and magntiude in opposite direction
ANGULAR MOMENTUM
moment of inertia
(mass x distance^2)
kg.m^2
ANGULAR MOMENTUM
angular displacement
change in angle
rad
ANGULAR MOMENTUM
angular velocity (w)
change in angle / change in time
rad.s^-1
ANGULAR MOMENTUM
angular acceleration
change in angular velocity / change in time
rad.s^-2
ANGULAR MOMENTUM
angular momentum (h)
moment on inertia (i) x angular velocity (w)
kg.m^2.s^-1
ANGULAR MOMENTUM
torque
moment of inertia x angular acceleration
N.m
ANGULAR MOMENTUM
angular impulse
torque x change in time = angular momentum
N.m.s
ANGULAR MOMENTUM
kinetic energy
1/2 x moment of inertia x angular velocity ^2
J
what are the symbols for :
1) linear velocity
2) linear acceleration
3) linear momentum
4) linear force
5) linear impulse
6) linear kinetic energy
1) v
2) a
3) p
4) f
5) imp
6) ke
what are the symbols for:
1) angular velocity
2) angular acceleration
3) angular momentum
4) torque
5) angular impulse
6) angular kinetic energy
1) w
2) a
3) h
4) T
5) Imp
6) Ke
CIRCULAR MOTION
arc length (s)
s = rθ
CIRCULAR MOTION
tangential velocity (VT)
VT = rw
CIRCULAR MOTION
tangential acceleration (aT)
aT = ra
CIRCULAR MOTION
radial acceleration (Ra)
aR = VT^2 / r = rw^2
CIRCULAR MOTION
how many degrees is 1 revolution?
2π radians
360 degrees
CONSTANT ACCELERATION
what do the elements of SUVAT mean?
S = displacement
U = initial velocity
V = final velocity
A = acceleration
T = time
CONSTANT ACCELERATION
what are the 4 SUVAT equations?
v = u + at
v^2 = u^2 + 2as
s = ut + 1/2at^2
s = 1/2(u+v)t
difference between translation and rotation
TRANSLATION - move through space
ROTATION - spinning around its own centre
scalar
vector
scalar: magnitude
distance, speed, time
vector: magnitude + direction
displacement, velocity, acceleration
kinematics
kinetics
1) motion of bodies, not think about the forces causing this motion
2) relationship between motion and causes e.g: torque, force
S =
U =
V =
A =
T =
S = displacement
U = initial velocity
V = final velocity
A = acceleration
T = time
SUVAT equations 1
v = u + at
SUVAT EQUATION 2
v2 = u2+ 2as
SUVAT EQUATION 3
s = ut + 1/2at^2
SUVAT EQUATION
s = 1/2(u+v)t
what colour photocytes are there
blue, red, green
RECORDING
what is the focal length?
distance from lens – sensor in back of camera
increase shutter speed = darker or lighter?
darker
what is aperture
what is it measured in
bigger number = ______ hole
size of whole infront of camera
f number
bigger f number = smaller hole
