11true??? because the lowermost point (point of contact) is always at rest w.r.t the ground => there is no relative motion b/w the ground and that point => no friction
the frictional force on the point of contact of a disc rolling perfectly down an inclined plane is zero
Tell whether the statement is correct or wrong
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6 Answers
11
62Always remember
No relative motion does not mean zero friction
It only means "STATIC FRICTION"
There can be friction acting and still could be a case of pure rolling..
11the condition 4 the rolling motion is
HERE THE VELOCITY OF THE PLATFORM AND THE VELOCITY OF THE POINT OF CONTACT MUST BE SAME
SO
v=vs
IN THIS CASE THE FRICTIONAL FORCE WILL ALWAYS BE LESS THAN THE MAX VALUE
THAT IS
f<μN
1nishant bhayia
when there is pure rolling then how the friction can still act and not disturbing the pure rolling
Please explain it
106in pure rolling either the frictional force is zero OR it is static friction because the point of contact doesn't move.. If u have a body that is already in pure rolling and no external force acts on it that changes its linear or angular velocity then friction WONT act...
But if any of these is changing and rolling motion is continued then friction will act to cause the corresponding change in angular velocity or linear velocity..
In an inclined plane.. gravity increases the linear velocity so there has to be increase in angular velocity to maintain pure rolling .. hence friction will act up the plane BUT it will be static friction only
11have a look at this 1
http://targetiit.com/iit_jee_forum/posts/rolling_friction_67.html