A crowbar used for turning a stone in the diagram in which direction (A Or B) is the pivot to be shifted to increase the ma write with reason
Answers
Answer:
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Explanation:The moment of a force is the product of a force multiplied by the perpendicular distance from the force to the pivot.
These types of problems are handled by knowing that for balance to occur, the sum of clockwise moments equals the sum of counter-clockwise moments.
In the case of the crowbar, the counter-clockwise moment is the weight of the load multiplied by the distance from the load to the fulcrum.
The clockwise moment is the effort multiplied by the distance from the effort to the fulcrum. At balance these forces are equal. If the clockwise moment is greater than the counter-clockwise moment, the load will be lifted.
If a is the distance from A to the fulcrum, and b is the distance from B to the fulcrum, then the mechanical advantage is b/a. If a and b are equal, there is no mechanical advantage. If the fulcrum is moved towards A, a becomes smaller and the mechanical advantage increases.