ReasoningModerate1 mark
2(iii)
Case 1: Lata cuts a potato into two halves, using a cutter which belongs to a Class II lever. She needed effort E1. Case 2: Then she cuts one half of this potato again, but this time she needed effort E2. If E1 > E2 then:
Give a reason for your answer in (a) above.
Topic: Principle of moments in a Class II lever
Question wording verified against source paper
Answer
Exam answer
In a Class II lever, the load lies between the fulcrum and effort. Placing the potato closer to the hand makes it farther from the fulcrum, increasing the load arm; hence a larger effort is required.
Explanation
By the principle of moments, effort × effort arm = load × load arm.
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