KIN 335 - Biomechanics
LAB: Ground Reaction Forces - Linear Kinetics
Reading Assignment: 1) Luhtanen, P. and Komi, P.V. (1978). Segmental contribution to forces in vertical jump.
European Journal of Applied Physiology, 38 (3): 181-188. 2) Harman, E.A., Ro

Trigonometry It is possible to solve many force and velocity problems by drawing vector diagrams. However, the degree of accuracy is dependent upon the exactness of the person doing the drawing and measuring. In addition, this approach is time consuming c

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KIN 335 - Biomechanics
LAB: Projectile Motion
Introduction: Performance in many sport activities is dependent on the ability to either control or predict the motion
of a projectile. In attempting to produce a particular trajectory of a projectile,

KIN 335 - Biomechanics
Example Problems: Linear and Angular Kinetics
1) A 75 kg jumper lands stiff-legged on the floor and changes his velocity from 4.5 m/s to zero in 0.15
seconds. Compute the average ground reaction force under his feet during this time

EPE 335 - Biomechanics
LAB: Movement Description
Recommended Reading Assignment: Textbook: Chapter 2
Introduction: In order for descriptions of body segments to be meaningful, movement specialists must
be able to communicate with one another using a stand

Uniformly Accelerated Motion
Under special circumstances, we can
use a series of three equations to
describe or predict movement
Vf = Vi + at
d = Vit + 1/2at2
Vf2 = Vi2 + 2ad
Most often, these equations are used to
describe either horizontal or vertical

KIN 335 Biomechanics
Practice Problems: Uniformly Accelerated Motion
(g = 9.8 m/s2 or 32 ft/s2)
1.
If an athlete jumped 2 feet high and left the ground at an angle of 20 degrees with respect to the
horizontal, how fast was the athlete going in the forward

superior
(cranial)
lateral
anterior
(ventral)
medial
NOT SHOWN
posterior
(dorsal)
proximal
inferior
(caudal)
distal
Directional Terms
Distal - farther from trunk
Lateral - away from midline
Anterior - front side in
Proximal - closer to trunk
Medial - clos

Relationships between linear
and angular motion
Body segment rotations
combine to produce
linear motion of the
whole body or of a
specific point on a body
segment or implement
Joint rotations create
forces on the pedals.
Forces on pedals rotate
crank w

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Radial Forces
Remember: objects
must be forced to
follow a curved path
Two forces play a role
in radial acceleration
(action-reaction pair)
aresultant
atangential
aradial
Centripetal force
Centrifugal force
Centripetal force: center seeking force
fo

Curvy Stuff Practice Problems
The curves provided on the following pages represent instantaneous profiles of
displacement (D), velocity (V), or acceleration (A) with respect to time (T). For each
curve, enter the most appropriate time (Ti) that represents

1.
Two speed skaters (S1 and S2) enter the final curve (point A) with exactly the same velocity (say, 20
m/s). At this instant they are tied. Throughout the first half of the curve (points A-C), it appears that
the athlete in the outside lane (S2) remains

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KIN 335 - Biomechanics
PROBLEM SET 1
Instructions: Read each question carefully. On a separate sheet of paper, complete each
problem and label your final answer clearly. Make sure that you show all of your work for full
credit.
1. A new trail leads

KIN 335 Biomechanics
Practice Problems: Uniformly Accelerated Motion
(g = 9.8 m/s2 or 32 ft/s2)
1.
If an athlete jumped 2 feet high and left the ground at an angle of 20 degrees with respect to the horizontal, how fast
was the athlete going in the forward

Stoichiometry Conversion between units can be made very simple if you use the principle of stoichiometry. In general, it is a very good practice to write down the units to each and every quantity entered into a mathematical equation. This is because even

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KIN 335 - Biomechanics
PROBLEM SET 1
Instructions: Read each question carefully. On a separate sheet of paper, complete each
problem and label your final answer clearly. Make sure that you show all of your work for full
credit.
1. A new trail leads

1.
Two speed skaters (S1 and S2) enter the final curve (point A) with exactly the same velocity (say, 20
m/s). At this instant they are tied. Throughout the first half of the curve (points A-C), it appears that
the athlete in the outside lane (S2) remains

Linear and angular kinematics
How far?
Describing change in linear or angular position Distance (scalar): length of path Displacement (vector): difference between starting and finishing positions; independent of path; as the crow flies Symbols:
linear

BONUS #1 The Klap Skate
Describe the problem that brought
about this innovation in speed
skating equipment.
Describe the innovation
What does it do?
Which specific mechanical
principle does this skate address
and how does it really work? Be
specific.
H

Curvy Stuff Practice Problems
The curves provided on the following pages represent instantaneous profiles of
displacement (D), velocity (V), or acceleration (A) with respect to time (T). For each
curve, enter the most appropriate time (Ti) that represents

BONUS #2a Manipulating Friction
The magnitude of Flim between contacting surfaces is frequently of great importance in athletic activities. Clearly describe five examples in which an athlete attempts to manipulate sliding friction (either increase or dec

Basic Kinetic Concepts
Inertia:
Natural property of a body to resist
a change in state of motion (i.e., state of
motion defined by velocity, state of
motion = acceleration)
Newtons 1st Law: Inertia
A body will stay at rest.
A body will continue to mov

Work
Work = Force x parallel distance
(parallel component
of displacement)
Wk = F d parallel
F
F
F=
dparallel
Units: N m = J = " joules" = ( kg m2 / s2 )
average force
computed over
the distance
r
r
When F is not parallel tord , then we must take the comp

Angular Kinetics
similar comparison between linear and
angular kinematics
Linear
Angular
Mass
Moment of inertia
Force
Torque
Momentum
Angular momentum
Newtons Laws
Newtons Laws (angular analogs)
resistance to angular
motion (like linear
motion) dependen