Midterm 2

Question 1

Centre of Pressure (COP)

Answer 1

The point on a plane surface at which the resultant pressure on the surface may be taken to act

Question 2

Force

Answer 2

a mechanical interaction between an object and its surroundings, usually measured in Newtons

Question 3

Force Platform

Answer 3

A n instrument used to measure the reaction forces in three dimensions (X,Y,&Z) and the moments about those three axes

Question 4

Impulse

Answer 4

the area under a force-time curve (Ns), which corresponds to the force-time integral

Question 5

Kinetics

Answer 5

the description of motion of a body in terms of the forces that cause the motion

Question 6

Magnitude

Answer 6

size or amplitude

Question 7

Vector

Answer 7

a quantity that conveys both magnitude and direction

Question 8

Kinematics

Answer 8

descriptions of motion of a body in terms of displacement, velocity, and acceleration, without reference to the forces causing the motion

Question 9

Sagittal Plane

Answer 9

a plane dividing the human body into left and right halves

Question 10

Transverse Plane

Answer 10

a horizontal plane dividing the body into top and bottom halves

Question 11

Frontal (or coronal) Plane

Answer 11

a plane dividing the body into anterior and posterior portions

Question 12

Motion Capture Guidelines

Answer 12

• position single cameras for 2-D trials perpendicular to the plane of motion
• position cameras such that the points to be digitized are not obscured
• maximized image size
• illuminate the subject to ensure there is a good contrast between subject and background
• Control object/scaling rod
• etc.

Question 13

Dynamic Analysis

Answer 13

utilizing free body diagrams to analyze force and moments occurring within the body during motion

Question 14

Free body diagram

Answer 14

a graphic-analysis technique that defines a system and indicates how the system interacts with its surroundings

Question 15

Force

Answer 15

mechanical interaction between an object and its surroundings

Question 16

law of acceleration

Answer 16

law stating that force is the product of an objects mass and acceleration

Question 17

law of action-reaction

Answer 17

law stating that for every action there is an equal and opposite reaction

Question 18

moment of force

Answer 18

the product of a force and its perpendicular distance to a point causing rotation about that point

Question 19

Ground Reaction Force

Answer 19

reaction force provided by the horizontal support surface on an object subjected to gravitational forces

Question 20

Degrees of Freedom

Answer 20

6 degrees of freedom
Translational parameters
- anterior- posteriror
-medial-lateral
- proximal - distal (upward - downward)
Rotational Parameters
- abduction-adduction
- internal-external
- flexion-extension