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The equation of principle of moment for a lever is-

The equation of principle of moment for a lever is- Correct Answer load arm length ×  load = effort arm length × effort

CONCEPT:

  • Principle of moments: A body will be in rotational equilibrium if the algebraic sum of the moments of all forces acting on the body, about a fixed point is zero.
  • Moment of force: It is also called torque.
    • The torque due to a force gives us the turning effect of the force about the fixed points on the axis
    • It is measured as the product of the magnitude of the force and the perpendicular distance of the line of action of the force from the axis of rotation
  • Lever: It is a light rod (negligible mass) pivoted at a point along its length. This point is called a fulcrum.

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where F1 is some weight to be lifted called a load, d1 is the distance of the load from the fulcrum called the load arm, F2 is the effort applied to lift the load, and d2 is the distance of effort from fulcrum called effort arm.

EXPLANATION:

  • The equation for the principle of the moment for a lever is:

effort arm ×  load = load arm × effort 

⇒ F1 × d1 =  F2 × d2

  • Hence option 1) is correct.

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