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Limiting Friction

A It is diffi...

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A It is difficult to start the motion of a body on a rough surface, rather than tomaintain the motion of the body. R: Static friction is always greater than thekinetic friction.

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Q. Mark the correct statements about the friction between two bodies.
(a) Static friction is always greater than the kinetic friction.
(b) Coefficient of static friction is always greater than the coefficient of kinetic friction.
(c) Limiting friction is always greater than the kinetic friction.
(d) Limiting friction is never less than static friction.

Q. Match the following:
List I contains either an action or an observation. Match each of these, respectively to the correct effect, or a reason from list II.

List I	List II
a. Two rotating discs are brought in contact-coaxially	e. Generated force of friction is equal to applied external force
b. A contact force exists between a rough surface and a body placed on it	f. Rotational Kinetic Energy is transformed partially into heat
c. For a body on a rough surface, maintaining motion is easier as compared to initiating it	g. Attributed to resultant of normal reaction and coefficient of friction between the surfaces
d. Static friction is less than limiting friction	h. As kinetic friction is less than static friction

Q. What effect will it have on the motion of the body if it is made to move on a sandy surface rather than a smooth surface?

Q. Case I: A block of mass 1 kg is placed on a rough horizontal surface.
Case II: A block of mass 1 kg is placed on a rough horizontal surface and another identical block is kept over it.
Choose the correct statement.

Q. A body of mass

2

k g

is placed on a horizontal surface having coefficient of kinetic friction

0.4

and coefficient of static friction

0.5

. during the sliding motion of the body the frictional force is

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