Chapter 4 Work, Energy, & Power
Explaining the causes of motion without Newton.
Mechanically, work is done on an object when a force causes a
change in position.
The work done on a body by a force is equal to the product of its
magnitude and the distance
Chapter 6 Angular Kinematics
Angular motion occurs about an axis of rotation
all parts of a body move through
the same angle
Angular kinetics deals with angular
Nearly all human moveme
Chapter 7 Angular Kinetics
Angular kinetics is the study of torques and their rotational effects on
Torque is the turning effect of a force exerted at a distance to an axis:
T = F r
Torque trumps force
Forces create linear movement, but
Chapter 5 Torques and Moments of Force
Moment of Force or Torque:
What causes a change in the state of linear motion of an
What causes a change in the state of angular motion of an
Angular analog of force
Centric vs. eccentric force
Linear Kinematics Chapter 2
Describing objects in motion
Forms of motion?
What information do we get
Identifying location in space
At the start of movement?
At the end of movement?
At a specific time in the midst of movement?
Instructor: Joshua Weinhandl, Ph.D.
TA: Kevin (Cody) Fontenot
My Research Interests
Injury mechanisms and risk factors
Movement coordination variability
Computer simulation of human movement
Branches of Mechanics
Rigid Body Mechanics
Chapter 1: Forces
What is a force?
Effect that one body has on another
A push or pull applied to an object
That required to change the state of motion of
an object (i.e., that which causes acceleration)
Chapter 3: Linear Kinetics
Vertical GRFs in Walking and Running
Running has higher force for a shorter duration.
less dynamic than running
forces closer to bodyweight
more similar to standing
than to running