Biomechanics

    Biomechanics
    Good manual handling technique generally requires extensive use of which muscles?
    The muscles of the thighs are the strongest and should be used in manual handling tasks.
    Author: rikazzz Comment
    Biomechanics
    Most of our bones that articulate at freely movable joints can be described as third-class levers. What does this mean?
    In third-class levers, the muscle force (effort) is between the load and the fulcrum (the joint). Choice D can be satisfied by first- and third-class levers.
    Author: rikazzz Comment
    Biomechanics
    What is the purpose of “counterbalancing” in manual handling? To:
    Counterbalancing involves placing the centre of gravity to one side of the base of support so that the gravitational pull on your body assists in moving the patient.
    Author: rikazzz Comment
    Biomechanics
    Which of the following statements is a characteristic of “third-class levers”?
    Third-class levers are “inefficient” in the sense that the muscular force that needs to be exerted will exceed the load force to be shifted. Nevertheless human muscles are able to generate the forces required for human activities, and we have the benefit of a very large range of movement for our limbs.
    Author: rikazzz Comment
    Biomechanics
    In a Hamilton-Russell traction system, a moveable pulley provides a mechanical advantage. What does this mean? That the:
    When the effort force is less than the load force, there is a mechanical advantage. Traction and counter-traction force must be equal.
    Author: rikazzz Comment
    Biomechanics
    When two forces of magnitude 8 N and 12 N are added vectorially, what value could the resulting vector NOT have?
    The maximum value that can be obtained by adding two vectors of length 8 and 12 N is 20 N when the vectors are in the same direction. Hence choices A, B and C are all possible.
    Author: rikazzz Comment
    Biomechanics
    What is the meaning of “work” in the scientific sense?
    The amount of work done on an object is the amount of energy transferred to that object.
    Author: rikazzz Comment
    Biomechanics
    In which of the following cases is the greatest amount of work being done on the object that is experiencing the force?
    Work = force × distance, so 1000 N × 50 m = 50,000 Nm is the greatest amount.
    Author: rikazzz Comment
    Biomechanics
    What is the weight of a nurse if her mass is 65 kg? (Use acceleration due to gravity of 10 m.s−2.):
    Weight is the force with which gravity attracts you to the Earth. Use Newton’s second law, weight, F = m × a = 70 × 10 = 700 N. The unit of force is the newton, N.
    Author: rikazzz Comment
    Biomechanics
    Choose the one correct statement:
    Weight is the force with which gravity attracts you to the Earth. Your weight would be different on the moon (say), but your mass would be the same.
    Author: rikazzz Comment