2.0 Biomechanics Of Movement

Question 1

What are the 3 types of motion in Kinematics?

Answer 1

• Translational (Linear, Gliding)
• Rotary (Rotational ex. Elbow Flexion)
• Curvilinear (Combination; Knee flexion/extension)

Question 2

What are the planes motions can be analyzed in?

Answer 2

• Sagittal Plane
• Frontal Plane
• Transverse Plane

Question 3

What are the 6 directions of motion across typical joints?

Answer 3

• Flexion/Extension
• Abduction/Adduction
• Medial Rotation/Lateral rotation

Question 4

This is a branch of mechanics that deals with the analysis of forces

Answer 4

Kinetics

Question 5

This is the study of forces acting on a system when no motion is occurring (Equilibrium)

Answer 5

Statics

Question 6

This is the study of forces acting on a system when motion is occurring.

Answer 6

Dynamics

Question 7

A physical quantity that can cause a change in position or alter the direction of speed of rotation of an object

Answer 7

Force

Question 8

What is the equation for force?

Answer 8

Force = Mass * Acceleration

Question 9

What are the 3 quantities of a vector?

Answer 9

1. Point of application
2. Direction
3. Magnitude

Question 10

What is Newton’s 3rd Law?

Answer 10

For every action (Force), there is always an equal and opposite reaction.

Question 11

This is the force equal and opposite to one bone acting on another.

Ex: Tibia on Femur

Answer 11

Joint reaction forces

Question 12

This is the force equal and opposite to the force acting on the ground.

Answer 12

Ground reaction force

Question 13

This is the vector sum of the 3 components of the ground reaction force.

Answer 13

Resultant ground reaction force vector

Question 14

What are the 3 qualities of a ground reaction force vector

Answer 14

1. Magnitude
2. Point of origin: Venter of pressure
3. Direction: Towards the center of mass

Question 15

This is the location of the average weight bearing force.

Answer 15

Center of Pressure

Question 16

The center of pressure is influenced by movement of the …

Answer 16

Center of mass of the body

Question 17

What is commonly used as an indicator for postural stability?

Answer 17

Center of Pressure

Question 18

This is a physical quantity that is a force spread over a given area

Answer 18

Pressure

P = Force/Area

Question 19

This is the force that causes rotation about an axis.

Answer 19

Torque/Moment

Torque = Force x Lever Arm

Question 20

This is the perpendicular distance from the line of force to the axis of rotation.

Answer 20

Lever Arm

Question 21

This is a rotation potential of forces outside of the body acting on a joint.

ex: Ground Reaction forces and gravity

Answer 21

External torques

Question 22

This is a rotation potential of forces acting within the body acting on a joint.

ex: Muscle forces

Answer 22

Internal Torque

Question 23

This is called the sum of the sagittal plane moments/torques at the ankle, knee and hip.

Answer 23

Support Moment

Question 24

What represents the total lower extremity demand required to support the body during weight bearing?

Answer 24

Support Moment

Question 25

What is the study of movement?

Answer 25

Kinematics