This document discusses concepts related to analyzing human motion kinetically. It outlines objectives to qualitatively analyze motion, identify common units of measurement for kinetic quantities, describe mechanical loads on the body, and identify tools for measuring kinetics. Basic concepts are defined, including inertia, mass, force, center of gravity, weight, pressure, volume, density, specific weight, torque, and impulse. Common metric and English units are provided. Mechanical loads, repetitive vs. acute loads, and tools like EMG and dynamography are also described. Finally, kinetic and kinematic vectors versus scalar quantities are defined.

1. Kinetic Concepts for Analyzing
Human Motion
Presentation Created by
Dr. Hazrat Bilal Malakandi. PT
DPT (IPM&R, KMU)

2. Objectives
• Qualitative analysis
• Identify common units of measurement for mass,
force, weight, pressure, volume, density, specific
weight, torque, and impulse
• Identify and describe the different types of
mechanical loads that act on the human body
• Identify and describe the available
instrumentation for measuring kinetic quantities
• Solve quantitative problem involving vector
quantities using both graphic and trigonometric
procedures

4. Basic Concepts Related to Kinetics
• Inertia
• Mass
• Force
• Center of Gravity
• Weight
• Pressure
• Volume
• Density
• Specific weight
• Torque
• Impulse

5. Common Units for Kinetic Quantities
Quantity Symbol Metric Unit English Unit
Mass m kg slug
Force F N lb
Pressure P Pa psi
Volume (solids) V m3 ft3
(liquids) liter gallon
Density  kg/m3 lb/ft3
Specific weight  N/m3 lb/ft3
Torque T N-m ft-lb
Impulse N • s lb • s

6. Mechanical Loads on the Human Body
• Compression
• Tension
• Shear
• Stress
• Torsion
• Bending
• Combined loading

7. Repetitive vs. Acute Loads
• Repetitive loading
• Acute loading
• Macrotrauma
• Microtrauma

8. Tools for Measuring Kinetic Quantities
• Electromyography (EMG)
– To study neuromuscular function
• Dynamography
– Primarily employed in gait research
– Starts, takeoffs, landings, baseball & golf swings,
and balance

9. Vectors & Scalar Quantities
• Kinetic vector quantities
– force weight, pressure, specific weight & torque
• Kinematic vector quantities
– Displacement, velocity & acceleration
• Scalar quantities
– Mass, volume, length & speed

10. vf