Biomechanics multiple choice w answers PDF

Preview

Summary

PART A: MC QUESTIONS 1. Biomechanics is most appropriately defined as the study of: (a) Human movement (b) Biological organisms (c) Movement mechanics (d) Athletic performance 2. ‘Quantity of matter of which an object is composed’ defines: (a) Inertia (b) Weight (c) Density (d) Mass 3. Which force e...

Description

PART A: MC QUESTIONS 1. Biomechanics is most appropriately defined as the study of: (a) Human movement (b) Biological organisms (c) Movement mechanics (d) Athletic performance 2. ‘Quantity of matter of which an object is composed’ defines: (a) Inertia (b) Weight (c) Density (d) Mass 3. Which force exerts a pull on a body? (a) Shear (b) Compression (c) Tension (d) All of the above 4. Which force acts parallel to a surface? (a) Shear (b) Compression (c) Tension (d) All of the above 5. When two bodies collide head-on and then continue to travel collectively in the original direction of motion of one of the bodies the direction of collective motion after the collision is determined by: (a) The relative momenta of the two bodies (b) The relative masses of the two bodies (c) The relative acceleration of the two bodies (d) The relative weights of the two bodies 6. The flexibility of bone is provided by: (a) Water (b) Calcium carbonate (c) Calcium phosphate (d) Collagen 7. …. 8. Translational motion along a curved line is described as: (a) Rectilinear motion (b) Curvilinear motion (c) Rotational motion (d) General motion 9. Examples of vector quantities include: (a) Force, mass, weight, pressure (b) Weight, torque, pressure, inertia (c) Work, power, friction, impact (d) Friction, pressure, torque, impulse

10. The magnitude of a vector is graphically represented by the: (a) Angle of orientation (b) Length in units (c) Direction (d) All of the above 11. If muscular force was to be kept constant, at which muscle angle of pull will torque be maximal? (a) 30 degrees (b) 45 degrees (c) 60 degrees (d) 90 degrees 12. The component of muscle force directed toward the centre of a joint is known as: (a) The rotary component (b) The stabilizing component (c) The dislocating component (d) None of the above 13. Properties of muscle tissue include: (a) Extensibility (b) Irritability (c) The ability to develop tension (d) All of the above 14. The greatest source of elasticity in human skeletal muscle tissue is attributed to: (a) The parallel elastic component (b) The series elastic component (c) The continuous elastic component (d) The active elastic component 15. When muscle provides a braking mechanism to slow limb movement, the contraction type is: (a) Eccentric (b) Isotonic (c) Anisometric (d) Anisotonic 16. The role of an antagonist muscle is to: (a) Cause a motion opposite to that of the movement (b) Prevent an undesirable motion of the movement (c) Produce a movement (d) None of the above 17. The observation that maximum tension can be generated in a muscle is attributable to: (a) The force velocity relationship (b) The action of the series elastic component (c) The change in mechanical advantage (d) All of the above 18. Electromechanical delay refers to the time required for: (a) Conduction of the nerve impulse to the neuromuscular junction (b) The nerve impulse to cross the neuromuscular junction (c) The muscle to initiate the development of tension after receipt of the nerve impulse

19.

20.

21.

22.

23.

24.

25.

26.

(d) A muscle to reach peak tension after the development of tension is initiated Elite sprinters are distinguished from their less-skilled counterparts by: (a) Higher stride rates (b) Longer stride lengths (c) Both A and B (d) Neither A and B If acceleration is zero, then the body: (a) Must be motionless (b) Must be moving with a constant speed (c) Has a constant velocity (d) More information is needed to answer this question When a long jump performance is analysed, which of the following is likely to be of the most interest? (a) The average velocity of the jumper during the run-up (b) The instantaneous velocity of the jumper at takeof (c) The average velocity of the jumper during the flight (d) The instantaneous velocity of the jumper at landing A POSITIVE acceleration does NOT always indicate an INCREASE in the magnitude of velocity because? (a) Gravity is usually negative (b) Acceleration of a body can reflect a change in the velocity direction (c) Acceleration is calculated from instantaneous velocity, and that value is typically positive (d) Horizontal velocity is independent of gravity A skater gliding on ice will continue to move in the same direction and with the same speed (in the absence of the action of additional forces). This exemplifies which of the following laws? (a) Newton’s first law of motion (b) Newton’s second law of motion (c) Newton’s third law of motion (d) The law of force Which of the following mechanical quantities is not dependent on time? (a) Work (b) Power (c) Kinetic energy (d) Velocity A change in momentum is caused by: (a) An impulse (b) An impact (c) A force (d) Work In explosive track and field events, the winner will probably have the largest: (a) Kinetic energy (b) Potential energy (c) Mechanical work (d) Mechanical power

27. Strain energy is a form of: (a) Potential energy (b) Kinetic energy (c) Caloric energy (d) Entropic energy 28. The amount of horizontal force required to initiate motion on an object sitting on a horizontal surface? (a) Must be greater than the coefficient of kinetic friction (b) Must be greater than the coefficient of static friction (c) Must be greater than the maximum static friction force (d) Is must be greater than the maximum kinetic friction force 29. The shortest (perpendicular) distance between the line of action of a force and axis defines what? (a) Torque (b) Fulcrum (c) Moment arm (d) None of the above 30. In the human body, the lever systems formed by muscles pulling on bones are: (a) First class (b) Second class (c) Third class (d) No one class predominates 31. If the insertion angle of a muscle on a bone is less than 90°, the efect of the parallel component of a muscular force on the joint is: (a) Stabilising (b) Dislocating (c) Rotatory (d) Translatory 32. As the angle of muscle insertion increases from 50° to 60°, the component of muscular force tends to: (a) Remain the same (b) Increase (c) Decrease (d) Turn into a dislocating force 33. The relative efficiency of a lever is determined by: (a) Mechanical advantage of the lever system (b) Length of the efort arm (c) Length of the resistance arm (d) Amount of force needed to move the lever 34. Third class lever systems favour: (a) Speed and distance (b) Balance (c) Force application (d) None of the above

35. For optimal performance in the shot put (real life situation) the projection angle (angle of release): (a) Should be 45 degrees (b) Should be greater than 45 degrees (c) Should be less than 45 degrees (d) Is dependent on initial velocity 36. For the trajectory of a projectile to be a perfect parabola, which assumptions must to be true? (a) The horizontal and vertical components of the velocity at release are EQUAL (b) Gravity afects only HORIZONTAL motion (c) AIR RESISTANCE is non-existent (d) Must be true, the trajectory will always be a perfect (e) External influences 37. When analysing human motion as projectile motion, the parabolic path refers to: (a) The centre of mass (b) The centre of volume (c) The navel (d) None of the above 38. A form of rotation initiated while a body is airborne but requiring that the body becomes airborne with some amount of angular momentum is known as: (a) “Reaction rotation” (b) “Cat rotation” (c) “Twist from a somersault” (d) All of the above 39. The statement “a rotating body will maintain in a state of constant angular motion acted on unless by an external torque” refers to: (a) Newton’s first law (b) Newton’s second law (c) Newton’s third law (d) Newton’s fourth law 40. Angular velocity is defined as: (a) Change in angular position in a given direction over a given time (b) Angular displacement divided by time twice (c) Both A and B (d) Neither A nor B 41. Which of the following quantities are equal? (a) 2∏ radians and 360 degrees (b) 270 degrees and ¾ revolution (c) Both A and B (d) Neither A nor B 42. The component of angular acceleration directed toward the centre of curvature defines: (a) Radial acceleration (b) Tangential acceleration (c) Angular acceleration (d) Linear acceleration

43. Which quantity is diferent on the moon compared to the earth? (a) Gravitational acceleration 44. Centrifugal force: (a) Is the same as centripetal force (b) Has the same magnitude of centripetal force (c) Has the same direction as centripetal force (d) All of the above are true 45. During execution of the hammer and discus throws, which of the following to exist at the instant of release? (a) Centripetal force (b) Centrifugal force (c) Both A and B (d) Neither A nor B 46. A person’s buoyancy is directly related to: (a) Mass (b) Weight (c) Volume (d) Density 47. The drag created by a pressure diferential between the lead and near sides of a body moving through fluid is defined as: (a) Form drag (b) Profile drag (c) Surface drag (d) Both A and B 48. The nature of a boundary layer of fluid surrounding a body depends on (a) The roughness of the body’s surface (b) The body’s velocity relative to flow (c) Both A and B (d) None of the above 49. The product of torque and the time during which it acts defines: (a) Linear momentum (b) Linear velocity (c) Linear acceleration (d) Linear impulse 50. A back spinning soccer ball in flight: (a) Will dip down towards the ground (b) Has the potential to travel further than a ball without spin (c) Has a low pressure region of air flow underneath (d) Will swing left to right

PART B: T/F QUESTIONS 1. Centre of mass and centre of gravity are the same thing T 2. The buoyant force acting on an object in a fluid is equal to the weight of the fluid displaced by the body T 3. When using the right hand rule, the fingers point in the direction of the angular vector T 4. In linear translation, all body parts move the same direction in the same time along curved pathway F 5. Bone is strongest under compression and weak against shear stress T 6. Angular displacement is the length of the angular path of a rotating body F 7. A body is in static equilibrium if a displacement moves the centre of gravity higher F 8. The work done by a force is equal to the change in energy that it produces T 9. Centripetal forces always act away from the centre of rotation F 10. Instantaneous velocity is equal to the average speed over a very short time or distance F 11. Maximum static friction is always greater than dynamic friction T 12. Putting wider than standard width tyres on a car will increase the friction between the car and the road surface F 13. The energy a body has because it is moving is known as mechanical energy F 14. An object experiencing negative acceleration will be slowing down F 15. A lift force cannot act downwards F...