biomechanics 2

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Author:
JenniNyla
ID:
78879
Filename:
biomechanics 2
Updated:
2011-04-12 01:37:47
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biomechanics exam two
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Description:
quizes 5,6,7,8
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  1. Which type of muscle contraction is used as a braking mechanism to1decrease the velocity of the arm after the ball has left your hand?

    A dynamic
    B concentric
    C isometric
    D isotonic
    E eccentric
    E eccentric
    (this multiple choice question has been scrambled)
  2. What is the function of a muscle acting as a neutralizer?

    A causes the opposite joint rotation to the one desired
    B contracts to keep the two bones making up the joint from separating
    C cooperates with other muscles to create the desired joint rotation
    D prevents undesired joint rotation caused by the contracting muscles
    D prevents undesired joint rotation caused by the contracting muscles
    (this multiple choice question has been scrambled)
  3. What is the function of a muscle acting as a stabilizer?

    A contracts to keep the two bones making up the joint from separating
    B prevents undesired joint rotation caused by the contracting muscles
    C causes the opposite joint rotation to the one desired
    D cooperates with other muscles to create the desired joint rotation
    A contracts to keep the two bones making up the joint from separating
    (this multiple choice question has been scrambled)
  4. Which of the following illustrates eccentric muscle contraction of the hipextensors?

    A holding a tennis racquet while awaiting a serve
    B bending forward with knees straight to touch the floor
    C stepping up onto a bench
    D standing at attentionEnone of the above
    B bending forward with knees straight to touch the floor
    (this multiple choice question has been scrambled)
  5. In order to reduce "form drag," you should:

    A increase the relative velocity
    B increase fluid density
    C reduce the surface roughness at higher velocities
    D reduce the cross-sectional area
    E all of the above
    D reduce the cross-sectional area
    (this multiple choice question has been scrambled)
  6. Which of the following statements is true of the Magnus force?

    A It causes a ball to move up, down, left, or right
    B both A and B
    C It can created by a spinning ball
    D It direction is always upward
    E all of the above
    B both A and B
    (this multiple choice question has been scrambled)
  7. A runner having an absolute velocity of +6 m/s is running on a windyday. The wind has an absolute velocity of +3 m/s. The relative velocity is ___

    A 9 m/s
    B 2 m/s
    C 3 m/s
    D 18 m/s
    E none of the above
    C 3 m/s
    (this multiple choice question has been scrambled)
  8. An object will float if ___

    A it has a specific gravity > 1.0
    B it has a density > 1000 kg/m3
    C it has a buoyant force < 1000 N
    D both A and B
    E none of the above
    E none of the above
  9. A joint that allows uniaxial rotation of articulating bone surfaces arounda longitudinal axis is called

    A a hinge joint
    B an axial joint
    C a gliding joint
    D a pivot joint
    E a twisting joint
    D a pivot joint
    (this multiple choice question has been scrambled)
  10. A lever in the which the force acting on the lever is in between thefulcrum and the resistance is called a2

    A 1st class lever
    B 3rd class lever
    C 2nd class lever
    B 3rd class lever
    (this multiple choice question has been scrambled)
  11. A joint that is "freely movable" and "highly mobile" would be classified as

    A synovial and amphiarthrodial
    B diarthrodial and fibrous
    C synovial and synarthrodial
    D synovial and diarthrodial
    E diarthrodial and cartilaginous
    D synovial and diarthrodial
    (this multiple choice question has been scrambled)
  12. The most stable triaxial joint is the . . .

    A anklejoint
    B knee joint
    C elbow joint
    D hip joint
    E shoulderjoint
    D hip joint
    (this multiple choice question has been scrambled)
  13. The forces that can influence the movement of a projectile are

    A weight
    B gravity
    C both A and B
    D drag
    E all of the above
    C both A and B
    (this multiple choice question has been scrambled)
  14. If the relative projection height is positive, which of the followingstatements is/are true?2

    A horizontal displacement will decrease
    B horizontal & vertical displacement will increase
    C horizontal displacement will increase
    D horizontal & vertical displacement will decrease
    C horizontal displacement will increase
    (this multiple choice question has been scrambled)
  15. The optimal projection speed when relative projection height is zero willbe ___ meters/second.

    A 40
    B 45
    C 50
    D 55
    E none of the above
    E none of the above
  16. Which of the following statements is/are true?

    A As projection angle increases to 90 degrees, vertical displacement gets smaller
    B As projection angle increases to 90 degrees, vertical displacement gets larger
    C both A and B
    D When projection angle is 45 degrees, vertical displacement reaches its maximumvalue
    E none of the above
    B As projection angle increases to 90 degrees, vertical displacement gets larger
    (this multiple choice question has been scrambled)

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