1.3b biomechanics linear motion Flashcards
what is linear motion
movement of a body in a straight or curved line where all parts move the same distance and direction
how is linear motion created
a direct force is applied to a body, where the force is applied directly to/through the com
distance
total length of the path covered from start to finish
distance (m) = speed (m/s) / time (s)
displacement
the shortest straight line route from start to finish
displacement (m) = velocity (m/s) / time (s)
speed
the rate of change in distance
speed (m/s) = distance (m) / time (s)
velocity
the rate of change of displacement
velocity (m/s) = displacement (m) / time taken (s)
acceleration/deceleration
-the rate of change in velocity
acceleration (m/s2) = (final - initial velocity (m/s)) / time taken (s)
acceleration (m/s2) = force (n) / mass (kg)
what is angular motion
movement of a body or part of a body is a circular path about an axis of rotation
how is angular motion applied
from an eccentric force applied to a body and outside of the com
TORQUE - turning or rotational force
how to remember axis of rotation
sam talks for far too long
how does movement at a joint take place
along a plane and about an axis
sam talks - flexion and extension
occurs along the sagittal plane
about the transverse axis
eg somersault
for far - abduction and adduction
occurs along frontal plane
about the frontal axis
eg cartwheel
too long - horizontal flexion and extension
occurs along transverse plane
about longitudinal axis
eg rotating in circle when discuss throwing
how is angular motion measured
radians (rad)
1 rad = 57.3 degrees
