WAEC Physics 2018 Objective — Question 28
Question 28 of 50 from the West African Examinations Council (WAEC) Physics 2018 Objective paper, with the correct answer and a full explanation.
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A bar AB is balanced horizontally on two knife edges as illustrated above (F₁=20N, F₂=20N). Determine the weight of the bar
- A. 10.0N
- B. 20.0N
- C. 40.0NCorrect
- D. 50.0N
Explanation
For equilibrium, the sum of the upward reaction forces equals the weight: W = F₁+F₂ = 20+20 = 40.0N.
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