The Mechanical Advantage of a Second Class Lever is

  1. always more than 1
  2. always less than 1
  3. always equal to 1
  4. None of these
Monis Rasool Professor Asked on 2nd June 2015 in General Knowledge.
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  • 1 Answer(s)

    Option 1 is the right answer.

    A lever is a machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum. It is one of the six simple machines identified by Renaissance scientists.  The ratio of the output force to the input force is the mechanical advantage of the lever.

    Classes of levers :

    Class 1: Fulcrum in the middle: the effort is applied on one side of the fulcrum and the resistance on the other side, for example, a seesaw, a crowbar or a pair of scissors. Mechanical advantage may be greater or less than 1.

    Class 2: Resistance in the middle: the effort is applied on one side of the resistance and the fulcrum is located on the other side, for example, a wheelbarrow, a nutcracker, a bottle opener or the brake pedal of a car. Mechanical advantage is always greater than 1.

    Class 3: Effort in the middle: the resistance is on one side of the effort and the fulcrum is located on the other side, for example, a pair of tweezers or the human mandible. Mechanical advantage is always less than 1.

    Harsh Vardhan Professor Answered on 2nd June 2015.
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