extra work

Question 1

True or false: If a body is rotating with a constant angular velocity, the angular acceleration AND the linear, centripetal acceleration of the body are zero.

Answer 1

False: even with no angular acceleration, constant angular motion gives rise to a nonzero centripetal acceleration.

Question 2

True or False: When swinging your extended arm around in a circle (in a sagittal plane), your elbow has a greater arclength than your wrist.

Answer 2

False

Question 3

During a dive, if a diver goes from a full layout position to a tuck position, what will happen to her angular velocity?

Answer 3

NOT DECREASE
NOT REMAIN THE SAME
increase

Question 4

Which of the following quantities increases as moment of inertia decreases during the airborne phase of a dive?

Answer 4

Angular velocity

Question 5

Consider a person standing in the anatomical position. The moment of inertia of the body rotating about the longitudinal axis is __________ the moment of inertia about the anteroposterior axis.

Answer 5

NOT CANNOT BE DETERMINED
NOT THE SAME AS

Question 6

A net force applied directly through the center of mass of a body:

Answer 6

NOT BOTH A AND B
NOT NEITHER

Question 7

Consider two objects with the same size, shape, and velocity but different masses flying through the same air at the same time, although the same drag force is applied to both objects the EFFECT of the force on the momentum of each is different.

Answer 7

True

Question 8

The point of application of a bouyancy force acting on an object is at the ________________ of the object.

Answer 8

Center of Volume

Question 9

When knee is flexed from anatomical position, what happens to the moment of inertia of the leg about the medio-lateral axis at the hip?

Answer 9

NOT INCREASE

Question 10

A net force applied directly through the center of mass of a body

Answer 10

changes linear momentum

Question 11

Consider two objects with the same size, shape, and velocity but different masses flying through the same air at the same time, although the same drag force is applied to both objects the EFFECT of the force on the momentum of each is different.

Answer 11

True

Question 12

The point of application of a dynamic fluid force force acting on an object is at the ________________ of the object.

Answer 12

NOT CENTER OF PRESSURE
NOT CENTER OF MASS
NOT CENTER OF VOLUME

Question 13

the buoyancy of a swimmer is influenced by the total body volume of the swimmer.

Answer 13

False only submerged volume

Question 14

Drag and lift are ALWAYS 90 degrees to one another.

Answer 14

True

Question 15

The leg extension machine shown in Figure 8.8 in your textbook shows the leg in two positions. The resistance torque (i.e., the torque provided by the machine):

Answer 15

Decreases as the leg reaches full extension

Question 16

Consider the mid-range of an elbow flexion movement (90 degree elbow angle). The moment arm of the muscle force providing flexion at the elbow is:

Answer 16

NOT NO SUCH CONCLUSION CAN BE MADE ABOUT MOMENT ARMS