Question: In the human body, most of the lever systems formed by muscles pulling on bones are what class?
Answer Choices: 1st class 2nd class 3rd class none of the choices are correct
Answer: 3rd class
Question: 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?
Answer Choices: the see-saw will rotate clockwise the see-saw will rotate counterclockwise the see-saw will balance need more information to predict outcome
Answer: the see-saw will rotate counterclockwise
Question: The resistance arm (RA) will always be longer than the force arm (FA) in what class lever?
Answer Choices: 1st class 2nd class 3rd class none of the choices are correct
Answer: 2nd class
Question: Third class lever systems favor which of the following?
Answer Choices: speed strength both speed and range of motion all of the choices are correct
Answer: both speed and range of motion
Question: A seesaw is an example of which class of lever?
Answer Choices: 1st class 2nd class 3rd class none of the choices are correct
Answer: 1st class
Question: The relative efficiency of a lever is proportional to which of the following?
Answer Choices: mechanical advantage of the lever length of the force arm length of the resistance arm the amount of force needed to move the lever
Answer: mechanical advantage of the lever
Question: When a muscle contracts at a joint, which of the following affects torque?
Answer Choices: the rotary component of the muscle force the stabilizing component of the muscle force the dislocating component of the muscle force none of the choices affect torque
Answer: the rotary component of the muscle force
Question: The amount of torque which must be generated by the biceps brachii at the elbow in order to maintain the arm in a particular position is 50 Nm. If the biceps attaches to the radius at a perpendicular distance of 3 cm from the joint center at the elbow, how much force must the muscle produce? Pay attention to units!
Answer Choices: 1667 Newtons 17 Newtons 150 Newtons 1.5 Newtons
Answer: 1667 Newtons
Question: Which of the following affects the force-generating capability of a muscle?
Answer Choices: the muscle length and cross-sectional area the angle and distance from the joint center of the tendon attachment to bone the velocity of muscle shortening all of the choices affect the force-generating capability of a muscle
Answer: all of the choices affect the force-generating capability of a muscle
Question: Which of the following must be true for an object to be in a state of static equilibrium?
Answer Choices: the sum of all vertical forces acting on the object must be equal to zero the sum of all horizontal forces acting on the object must be equal to zero the sum of all torques acting on the object must be equal to zero all of the choices must be true
Answer: all of the choices must be true
Question: Which of the following does not increase stability?
Answer Choices: lower the COG increase size of base of support decrease mass increase friction
Answer: decrease mass
Question: Which properties are associated with the Center of Gravity?
Answer Choices: the point about which a body’s weight is equally balanced in all directions the location of the center of gravity shifts in the direction of greater mass the torques created by the weights on either side of the center of gravity are equal all of the choices above are correct
Answer: all of the choices above are correct
Question: Which of the following quantities is zero for an object in static equilibrium?
Answer Choices: momentum kinetic energy both momentum and kinetic energy neither A nor B
Answer: both momentum and kinetic energy
Question: In which of the following situations is maximal stability desirable?
Answer Choices: a swimmer’s starting position on the blocks before a race a Sumo wrestler’s crouched defensive stance maximal stability is desirable in both situations maximal stability is desirable in neither situation
Answer: maximal stability is desirable in both situations
Question: Which statement is true regarding moment arm?
Answer Choices: Moment arm is largest when the angle of pull on a bone is 90° Changes in moment arm directly affect joint muscle torque. For torque to remain constant, more force must be produced when moment arm decreases. Both that the moment arm is largest when the angle of pull on a bone is 90° and that changes in moment arm directly affect joint muscle torque. all of the statements are true regarding moment arm.
Answer: all of the statements are true regarding moment arm.
Question: Which of the following is/are true regarding dynamic equilibrium?
Answer Choices: applies to bodies in motion involves components of inertia dynamic equilibrium applies to bodies in motion and involves components of inertia there is no such thing as dynamic equilibrium
Answer: dynamic equilibrium applies to bodies in motion and involves components of inertia
Question: What will happen to the COM of a human body if the arms are raised up overhead?
Answer Choices: it will move up it will move down it will not change need more information to predict
Answer: it will move up
Question: It is not possible to plagiarize when using your own previously published or submitted work.
Answer Choices: True False
Answer: False
Question: Accidental or unintentional plagiarism is not a big deal and is not considered an actual plagiarism violation.
Answer Choices: True False
Answer: False
Question: Using synonyms to replace keywords or phrases from the original source material without changing the grammatical structure is still a form of plagiarism.
Answer Choices: True False
Answer: True
Question: As long as I use quotation marks around original source material text and put an entry on my reference page, I am not committing plagiarism.
Answer Choices: True False
Answer: False
Question: Even if using proper paraphrasing and quotation marks, I still need to include an in-text citation as well as an entry on the reference page to avoid plagiarism.
Answer Choices: True False
Answer: True