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3. Alida runs her toy car on dry marble floor, wet marble floor, newspaperand towel spread on the floor. The force of friction acting on the car on(b)(a) wet marble floor, dry marble floor, newspaper and towel.newspaper, towel, dry marble floor, wet marble floor.towel, newspaper, dry marble floor, wet marble floor.wet marble floor, dry marble floor, towel, newspaper(c)(d)different surfaces in increasing order will be |
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Answer» Answer: (a) wet marble floor, dry marble floor, newspaper and towel Explanation: Friction DEPENDS on the roughness of a surface. This means that the rougher the surface is, the more friction will be exerted. Rough Surface ⇒ More Friction SMOOTH Surface ⇒ Less Friction This is because, on a rough surface, there are MANY irregularities present. A Marble floor is very smooth. If it is wet, it becomes more smooth as water INCREASES smoothness. So, the force of friction acting on a wet marble floor is the least, followed by a dry marble floor. Newspaper and towel both are relatively rough surfaces but newspapers have fewer irregularities. If you closely observe a towel, you will find that its surface is less smooth than a newspaper. So, the force of friction on a newspaper will be less than on a towel. |
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