Question: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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