A 30 kg child sits on the right end of a see-saw 1 m from the axis. If a 20 kg child sits on the left end of the see-saw 2 m from the axis, what will happen?
A. the see-saw will tilt to the right
B. the see-saw will tilt to the left
C. the see-saw will balance
D. need more information to predict outcome
Answer: B. the see-saw will tilt to the left
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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?