Question

varies in each case.
Q 18. Alisha rolls a metallic ball on a dry marble floor, a wet marble floor, a newspaper and a towel
spread on the floor. She observed that the ball stops after some time, but the distance covered
(1x4)
In all cases the ball comes to a rest due to friction which is -
(a) A contact force
(b) A non-contact force
(c) Magnetic force
(d) None of these
(ii)
The distance covered by the ball in all four cases is arranged in ascending order. Which
of these is the correctly arranged?
(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.
(iii)
If the dry marble floor is covered with a layer of sand then the -
(a) Ball will not move
(b) Ball will cover a shorter distance
(c) Ball will cover a greater distance (d) Ball will cover the same distance
(iv)
Suppose the ball is covered with a piece of cloth then, the friction acting on it in each
case will -
(a) Increase
(b) Decrease
(c) Remain the same
(d) None of these

Answer 1

Answer:

18 :a,ii:c,iii:b,IV:a