WAEC Physics 2023 Objective — Question 18
Question 18 of 50 from the West African Examinations Council (WAEC) Physics 2023 Objective paper, with the correct answer and a full explanation.
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A 100 kg device is pulled up a plane inclined at 30° to the horizontal with a force of 1000 N. If the coefficient of friction between the device and the surface is 0.25, determine the total force opposing the motion. [g=10 ms⁻²]
- A. 216.5 N
- B. 283.5 N
- C. 716.5 NCorrect
- D. 975.0 N
Explanation
Total opposing force = μmgcosθ + mgsinθ = 0.25×100×10×cos30° + 100×10×sin30° = 216.5+500 = 716.5 N.
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