In a simple lever, what is the mechanical advantage (MA) if an effort of 20 N lifts a load of 80 N?
Answer and explanation
Correct answer: D. 4
- Step 1: Mechanical Advantage is defined as the ratio of Load to Effort: MA = Load ÷ Effort. Step 2. Substitute: MA = 80 N ÷ 20 N = 4. Answer: 4. Why not the others: 0.25 inverts the ratio (20/80); 2 divides by 40; 60 is the difference (80 - 20).
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