WEEK 3 Flashcards
define kinematics
studies the description of motion
- describes how the velocity and acceleration of a body can change with time and changes with the position of the body
describe linear motion (x3)
- all parts of the body show the same trajectory
- results in a translation of a body
- rectilinear and curvilinear
what is angular motion
rotation around a point/ axis
define general motion
combination of linear and angular motion
describe the anatomical reference system (x5)
- erect standing position
- feet slightly seperated
- arms hanging relaxed at the sides
- palms of the hands facing forward
what is anterior
moving towards the front
define posterior
towards the back
define superior
towards the top of the body
define inferior
towards the bottom
defne lateral
away from the midline
define medial
toward the midline
define sagittal plane
cuts through the left side of the body and right side
- perpendicular to the medial lateral axis
define frontal plane
cuts off the front and back of the body
- perpendicular to the anterior posterior axis v
define transverse plane
cuts off the top and bottom of the body
- perpendicular to vertical axis
what 3 movements can be done in the saggital plane
- flexion
- extension
- hyper extension
identify the two movements with the frontal plane
- abduction
- adduction
define the complex joint motion arm circumductin
combination of flexion, extension, abduction and adduction
define complex joint motion rear foot
combination of inversion, adduction and plantar flexion at the sub talar joint
define distance
the length of the path followed
define displacement
the magnitude of the vector joining the initial and final points of the path followed
define speed
change in distance during a certain period
define velocity
change in displacement during a certain period of time
identify the linear velocity equation
position 2 - position 1 / time at 2- time at 1
units = metres per second
define acceleration
defined as how much velocity is changing every second
identify the acceleration equation
velocity 2 - velocity 1 / time 2- time 1
describe how to identify measurements when plotting curves
the area above the graph tells us about the magnitude of the curve below
- you MUST start with acceleration at the top
what are the 3 equations for constant acceleration
1) vf ( final velocity ) = vi ( initial velocity + a ( acceleration x t ( time)
2) s ( displacement)= initial velocity x time + 1/2 x acceleration x time squared
3) final velocity ^2= initial velocity ^2 + 2 x acceleration x displacement
define projectile motion
any object projected into the air. a projectile is a body in free fall that is subject only to the forces of gravity and air resistance. eg a ball
what is the number of gravity
-9.81 metres per second
how do you calculate gait based off step frequency
1 step divided by step time (s)
how do you calculate gait cycle through velocity
step length (m) divided by step time (s)
how do you calculate swim velocity
stroke length x stroke frequency
