Biomechanics Exam 3

work= force x displacement

product of force and the amount of displacement (in the direction of that force)

concentric (positive work)

if the displacement is in the same direction of the force

eccentric (negative work)

if the displacement is in the opposite direction of the force

isometric

has no displacement (not moving/no work) 

power

how quickly or slowly work is done

energy

the capacity to do work

power is max

velocity is approximately 0%

force is max

velocity is approximately 0%

kinetic energy

change in motion/displacement

potential energy

change in height

strain energy

change in deformation (getting stretched)

torque

moment of force or moment

torque causes changes in what

angular motion

counterclockwise rotation

positive torque

clockwise

negative torque

changes in the angle of the joint will affect what

moment arm length (r)

if the displacement is in the same direction of force we have

positive work

changes in the angle of the joint don’t effect the moment arm length

false

if an external force is applied direclty through an objects center of gravity, it is referred as

centric force

lifting your arms up high will raise your center of gravity

true

lifting your arms up high will increase vertical jump

false

planes

sagittal, frontal, and transverse

sagittal plane

vertical plane dividing the body
in right and left sides

frontal (coronal) plane

vertical plane dividing the
body in front (anterior) and
back (posterior) parts

transverse (transaxial or axial) plane

horizontal plane dividing the
body into upper (superior) and
lower (inferior) parts

anatomical axes

anteroposterior, transverse, and longitudinal

anteroposterior axes

runs from front to back

transverse axes

runs for left to right

longitudinal axes

runs from top to bottom