______ is a rotary, or angular, motion in which each subsequent point on one surface contacts a new point on the other surface

During dorsiflexion (open kinematic chain), what happens to the two articulating surfaces?

In open pack position, the joint surfaces are maximally separated from each other.

In a closed kinematic chain, the distal part moves on a fixed proximal part.

Injury to the ligaments is called a STRAIN.

In the plastic region of the load deformation curve, the tissue will go back to its original length once the stress/load is removed.

Creep is the elongation of tissue from the application of

a low-level load over time.

The acetabulofemoral joint is a hinge joint.

Impulse has a direct relationship with force.

As long as the center of gavity falls within the base of support, the body is in a stable position.

The mechanical advantage of a mucle is determined by dividing the length of the effort arm by the resistance arm length.

In a third class lever, the effort arm length is greater than the resistance arm length.

During shoulder abduction with a 2 lb dumbbell, the deltoid acts as a second class lever.

In lever class 1, the mechanical advantage could be 1, <1, or equal to one.

Shear forces that has an action line parallel / tangential to contacting surfaces that creates or limits movement between surfaces

The patella is an anatomic pulley the deflects the pull of the quadriceps muscle to increase its moment arm and make the contraction of the quadriceps more efficient.

In the line force system, COLLINEAR forces concur/meet at same point and lie on the same plane but do not act along the same line

Anything that contacts the segment must create a force on that segment.

In order to lift an object, the force that muscle should exert should equal the summed forces of the resistance.