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Static Friction

Why do we sli...

Question

Why do we slip on a recently mopped floor?

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Solution

The water on the surface decreases the friction.So we slip easily on a recently mopped floor.

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Q. Answer the following questions:

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

B. Alida runs her toy car on 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 [5 MARKS]

Why do we slip on a rainy day?

We are likely to slip while walking on a wet floor. What is the reason behind this?

Q. To mop-clean a floor, a cleaning machine presses a circular mop of radius

R

vertically down with a total force

F

and rotates it with a constant angular speed about its axis. If the force

F

is distributed uniformly over the mop and if coefficient of friction between the mop and the floor is

μ

, the torque, applied by the machine on the mop is :

Q. Why we are hurt less when we jump on a muddy floor in comparison to a hard floor?

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