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Question
Four boxes are labelled P, Q, and R. Box P is placed on a grass field, box Q is placed on a marble floor, and box R and S are placed on a wet marble floor. Which of the following boxes will require the minimum force to move?
Four boxes are labelled P, Q, and R. Box P is placed on a grass field, box Q is placed on a marble floor, and box R and S are placed on a wet marble floor. Which of the following boxes will require the minimum force to move?
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Solution
The correct option is D
Box S
We know that:
1. More perpendicular force by one surface or say “thrust” will lead to more friction, similarly less perpendicular force or thrust will lead to less friction. So, frictional force is greater for heavier objects and smaller for lighter objects.
2. Irregular surfaces like grass fields offer more frictional force than smooth surfaces like marble floors.
3. Lubricating a surface/wet surfaces offers less friction than dry surfaces.
Now, we can say that the minimum force required in case where the box having least mass and the box is kept on a smooth/wet surface.
Hence, box S requires the minimum force to move.
Box S
We know that:
1. More perpendicular force by one surface or say “thrust” will lead to more friction, similarly less perpendicular force or thrust will lead to less friction. So, frictional force is greater for heavier objects and smaller for lighter objects.
2. Irregular surfaces like grass fields offer more frictional force than smooth surfaces like marble floors.
3. Lubricating a surface/wet surfaces offers less friction than dry surfaces.
Now, we can say that the minimum force required in case where the box having least mass and the box is kept on a smooth/wet surface.
Hence, box S requires the minimum force to move.
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