exam 2 quizzes Flashcards
an angle formed between two body segments is an example of
a. an absolute angle
b. a relative angle
c. a double-jointed angle
d. a goniometric angle
e. a radial angle
b
What is the average angular velocity of an object moving through 30° in 2 s?
a. 0.07° per second
b. 15° per second
c. 30° per second
d. 60° per second
e. 120° per second
b
For a rotating object, the acceleration directed toward the center of rotation is called
a. the tangential acceleration
b. the rotary acceleration
c. the centrifugal acceleration
d. the linear acceleration
e. the centripetal acceleration
e
Which plane is perpendicular to the longitudinal axis?
a. frontal
b. sagittal
c. transverse
d. oblique
e. vertical
c
By convention, positive angular direction is
a. clockwise
b. counterclockwise
c. always in the direction of flexion
d. always in the direction of extension
e. semicircular
b
a gymnast dismounts the uneven parallel bars with some angular momentum about her transverse axis. Just after release, she is in a piked position. She then extends into a layout position before she lands. What happens as a result of this action
a. Her moment of inertia increases and she rotates slower.
b. Her angular momentum decreases.
c. Her angular momentum increases.
d. Her moment of inertia decreases and she rotates faster.
e. none of the above
a
angular impulse is the product of
a. force and the time that force is applied
b. torque and the time that torque is applied
c. angular inertia and angular momentum
d. mass and angular velocity
e. force and torque
b
In the equation for moment of inertia, which variable is most influential?
a. mass
b. impulse
c. radius of gyration
d. center of gravity
e. All are equally influential.
c
What is the relationship between torque and angular acceleration?
a. The greater the torque acting at the axis of rotation, the greater the angular acceleration of a given body.
b. The greater the torque acting at the axis of rotation, the lower the angular acceleration of a given body.
c. The lower the torque acting at the axis of rotation, the greater the angular acceleration of a given body.
d. Torque and angular acceleration are not related.
a
The vertical force that always acts upward is
a. gravity
b. acceleration
c. drag force
d. turbulence
e. buoyant force
e
For a submerged object, the buoyant force acts at the
a. center of gravity
b. center of mass
c. radius of rotation
d. center of volume
e. all of the above
d
Water pressure __________ with depth. Pressure is defined as __________.
a. increases linearly; force per unit area
b. decreases linearly; force per unit area
c. increases vertically; buoyant force
d. decreases vertically; buoyant force
e. increases linearly; weight of the fluid displaced by the object
a
When we consider the dynamic fluid forces acting on an object, we must take into account the velocity of the object as well as the velocity of the fluid itself.
true or false
true
A lift force can be directed upward, downward, or in any direction that is perpendicular to the fluid flow.
true or false
true
Which of the following terms is defined as deformation divided by original length?
a. stress
b. strain
c. strength
d. elasticity
e. plasticity
b
