18 Questions
What is the process called when a single force is decomposed into two perpendicular components?
Vector resolution
Which of the following is NOT one of the four characteristics of a force vector?
Velocity
Which type of internal force is generated by stimulated muscle, often under volitional control?
Active force
How do changes in joint angle affect the active force-generating capacity of two-joint muscles?
Active force is maximized at an intermediate joint angle
Which of the following is an example of an external force acting on the body?
Gravitational force
What is the term used to describe the phenomenon where a muscle's active force-generating capacity is reduced at shorter muscle lengths due to the overlap of the actin and myosin filaments?
Active insufficiency
What is the primary purpose of the loose-packed positions of the major joints in the lower extremity?
To facilitate movement during extended bed rest
Which of the following is a correct definition of kinetics?
The study of the effect of forces on the body
What is the formula for calculating the quantity of a force?
F = m * a
What is the standard international unit of force?
Newton
How are two or more collinear forces combined?
By adding the forces together
What is the result when two forces are concurrent (make an angle with each other)?
The resultant force is obtained by the cosine law
What do the sternal (S) and clavicular (C) portions of the pectoralis major muscle form?
A concurrent force system
What movement can the combined action of the anterior (A) and posterior (P) parts of the deltoid muscle produce?
Flexion or extension in the sagittal plane
When both heads of the gastrocnemius muscle pull in lateral (L) and medial (M) directions together, what force is exerted on the Achilles tendon?
Upward force
How can the resultant force of concurrent forces be determined when there are more than two forces?
Graphical method drawing a polygon
What is the product of a force and its moment arm that produces a torque or moment?
$F \times L$
In terms of joint mechanics, what is torque considered as?
A rotatory equivalent to a force
Test your knowledge on concurrent force systems and muscle movements, including how different muscle portions work together to produce specific movements in different planes.
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