In the human body, most of the lever systems formed by muscles pulling on bones are what class?
A. 1st class
B. 2nd class
C. 3rd class
D. no particular class is dominant
Answer: C. 3rd class
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Biomechanics Chapter 13
- When other factors remain constant, an increase in the mass of an object will subsequently increase the object's stability.
- If force is applied directly to the axis of rotation, torque will equal zero.
- The ability to control equilibrium defines ____________.
- The ratio of force arm to resistance arm defines _______________.
- Running barefoot results in higher joint torque at the knee than using running shoes.
- A motionless body is in a state of static equilibrium.
- The center of gravity of an object is always located within the object.
- Which one of the following incorrectly identifies the parts of a lever within the human body?
- When net muscle torque and joint movement occur in the same direction, what type of contraction occurs?
- Torque is the product of force and the perpendicular distance from the force to the axis, also known as the ____.
- A lever positioned with the applied resistance between the axis and the force is a ________ class lever.
- A concept indicating a balance between applied forces and inertial forces for a body in motion is called ________________.
- What will happen to the COM of a human body if the arms are raised up overhead?
- The ability to control equilibrium defines what?
- Which of the following can increase base of support?
- If disruption of stability is the desired outcome, which of the following should be observed?
- Which statement(s) is/are true regarding postural sway?
- What is the importance of segmental center of mass to the lever systems of the human body?
- Why do skilled high jumpers lower their COM on the last step?
- Which of the following is/are function(s) of antagonist muscles?
- What is the proposed advantage of Nautilus resistance equipment over free weights?
- Which type of equipment provides constant velocity?
- Which of the following is/are true regarding dynamic equilibrium?
- Which of the following is/are true regarding center of mass?
- Which of the following phrases is/are synonymous with torque?