Biomechanics Exam III

static equilibrium

when the system is in linear and rotational equilibrium and has a linear and rotational velocity of zero

dynamic equilibrium

when the system is in motion but is experiencing no change in velocity or direction

linear stability

resistance of a body to the disruption of it linear equilibrium

rotational stability

resistance of a body to the disruption of its rotational equilibrium

increase rotational stability by:

1. center of gravity in middle of support base

2. lower center of gravity

3. move center of gravity to side of support base where external force will be applied

increase linear stability by increasing ______

mass

in terms of linear stability, greater mass means:

1. greater friction force

2. greater force required to linearly displace/accelerate

in terms of linear stability, increased stability often means less ______

mobility

increase rotational stability by:

1. widening support base (in line with external force applied)

2. maximize distance between potential axis of rotation and line of gravity (i.e., maximize moment arm)

3. maximize distance between external force applied and receiving body

in terms of rotational stability, increasing the distance between the external force applied and the receiving body increases the ______ and ______ required to disrupt rotational stability

(blanks can be more than 1 word)

force applied; time of force application