How can you make it easier to move a large rock using a pry bar?

Prepare for the Alberta Trade Entrance Exam with flashcards and multiple-choice questions, featuring hints and explanations. Ace your exam!

Placing a smaller rock under the pry bar serves to reduce the amount of force needed to lift the larger rock. This technique takes advantage of the principle of leverage; by creating a fulcrum with the smaller rock, it increases the mechanical advantage. When the pry bar is positioned correctly, the small rock elevates the pry bar, allowing gravitational force to assist in lifting the larger rock. This way, less physical effort is required to move it compared to lifting the rock directly without a fulcrum.

Using a heavier pry bar, for instance, doesn’t necessarily help if it doesn’t improve leverage. Similarly, adding more pry bars could complicate the action without enhancing effectiveness if not properly coordinated. A longer pry bar could potentially provide more leverage if used properly, but the key technique to make the lifting easier with minimal effort is indeed to use a fulcrum like a smaller rock.

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