A ball is rolled on four surfaces:
a) marble floor,
b) on sand,
c) on cloth,
d) on wood.
The force of friction acting on the ball on these different surfaces in descending order will be:

b > c > d > a

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c > b > d > a

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d > b > a > c

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a > b > c > d

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Solution

The correct option is A b > c > d > a
Friction is caused due to the irregularities in the surfaces in contact. Larger the irregularities, i.e., rougher the surface, more is the friction. The surface of sand is the roughest of all, followed by cloth, wood and marble floor. Thus, maximum friction will be observed in sand followed by cloth, wood and marble floor.

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Question 3
Alida runs her toy car on a dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be
(a) wet marble floor, dry marble floor, newspaper and towel.
(b) newspaper, towel, dry marble floor, wet marble floor.
(c) towel, newspaper, dry marble floor, wet marble floor
(d) wet marble floor, dry marble floor, towel, newspaper

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(a) Wet marble floor, Dry marble floor, Newspaper, Towel
(b) Newspaper, Towel, Dry marble floor, Wet marble floor
(c) Towel, Newspaper, Dry marble floor, Wet marble floor
(d) Wet marble floor, Dry marble floor, Towel, Newspaper

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A. Why do we slip on a recently mopped floor?

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(a) wet marble floor, dry marble floor, newspaper and towel.
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A ball is rolled on four surfaces:a) marble floor, b) on sand, c) on cloth, d) on wood. The force of friction acting on the ball on these different surfaces in descending order will be:

A ball is rolled on four surfaces:
a) marble floor,
b) on sand,
c) on cloth,
d) on wood.
The force of friction acting on the ball on these different surfaces in descending order will be: