Q:

Which of the following is correct?

waelhammad
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2022-10-22
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Which of the following is correct?

  1. Fixed traction employs a moveable pulley to provide mechanical advantage.
  2. In suspended traction the traction force is equal to the tension in the cord.
  3. In suspended traction, counter-traction is provided by the friction between the patient and the bed.
  4. The traction force must be equal in magnitude to but opposite in direction to the counter-traction force.
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waelhammad
2022-10-22
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D: This a statement of Newton’s third law. Fixed traction does not employ a moveable pulley. In suspended traction, the traction force is greater that the tension in the cord. Counter traction is supplied by gravity as well as friction. 

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