Biomechanics Problems (Work, Power, Energy and Torque)
Conversion Factors and Equations:
1 pounds to kilograms = pounds x 0.454 or pounds / 2.2
1 Joule (J) = 1 Newton meter (Nm)
1 Watt (W) = 1 Joule / sec
1 pound to Newtons = (pounds) x (4.448 N/lb)
1 kil

TABLE 15-2
FACTORS AFFECTING THE MAGNITUDES
OF FLUID FORCES
FORCE
FACTORS
Buoyant force
specific weight of the fluid
volume of fluid displaced
Skin friction
relative velocity of the fluid
amount of body surface area exposed to the flow
roughness of the bo

Biomechanics Problems (Angular Kinematics)
1.
What is the angular velocity of a disk which spins 67.5 revolutions in 1.5 minutes?
(Calculate your answer in rev/min, degrees/sec, and rad/sec)
2.
If a gymnast on a high bar starts with an angular velocity of

Direction Of Acceleration
Direction Of Acceleration
Direction Of
Motion
Velocity
Increase
Velocity (+)
Positive
Direction (+)
Direction of
Acceleration
Positive
Acceleration (+)
Decrease
Velocity (-)
Positive
Direction (+)
Negative
Acceleration (-)
Increa

Biomechanics Problems (Velocity and Acceleration)
1.
When velocity is at a maximum, how can you describe the corresponding acceleration?
2.
A runner starts from rest and reaches a maximum velocity of 4.7 m/sec in 3.2 sec. What was
their average accelerati

Human Motion
To produce motion change has to occur
Motion is the act or process of changing place or position with respect to some reference object
A body at rest or in motion is totally dependent on the reference point
Relative motion is defined in relat

Levers
Lever
Type
Lever
Arrangement
1st Class
EA = RA or
EA RA
2nd Class
EA > RA
3rd Class
RA > EA
Mechanical
Advantage
Mechanical
Disadvantage
Favors Balance
Depends on
(Force or ROM) length of EA or
RA
Favors Force
Speed or ROM
Favors Speed or
Distance