WAEC Physics 2018 Objective — Question 31
Question 31 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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Two objects P and Q of masses 100kg and 20kg respectively are 1.2m apart on a horizontal surface. Calculate the net gravitational force acting on Q. (G = 6.67×10⁻¹¹Nm²kg⁻²)
- A. 1.11×10⁻⁷N towards P
- B. 1.11×10⁻⁷N towards Q
- C. 9.26×10⁻⁸N towards PCorrect
- D. 9.26×10⁻⁸N towards Q
Explanation
F = Gm₁m₂/r² = (6.67×10⁻¹¹×100×20)/1.2² = 9.26×10⁻⁸N, directed towards P (the larger mass, by mutual attraction).
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