WAEC Physics 2016 Objective — Question 11
Question 11 of 50 from the West African Examinations Council (WAEC) Physics 2016 Objective paper, with the correct answer and a full explanation.
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11. A plank is placed along the path on which a wheel barrow containing sand is pushed at a construction site to prevent it from sticking as illustrated in the diagram above. The large area of the plank prevents wheel barrow from getting stuck by A. increasing the reaction on the ground B. increasing the pressure on the ground C. decreasing the pressure on the ground D. decreasing the weight on the ground
- A. increasing the reaction on the ground
- B. increasing the pressure on the ground
- C. decreasing the pressure on the groundCorrect
- D. decreasing the weight on the ground
Explanation
Pressure = Force/Area, so pressure is inversely proportional to area, i.e. pressure increases with decreasing area. The plank has a larger area, so it reduces the pressure exerted on the ground.
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