IIT JEE , AIEEE Forum - Physics , Mechanics

satishrm

its very simple if u know rolling...topic...

if the wheels lock....kinetic friction acts

if the wheels dont lock.....static (why?)

after u apply brake...the wheel slows down....then it will start pure rolling.i.e velocity of lowermost point will be zero wrt floor....

but how will u maintain tht..since car is under..a?
'
static friction comes into play...it applies force of suitable magnitude...such that torque generated by it is such tht..resulting angular acc ( aa ) is such tht

a = r (aa)

a- acc of centre of mass of wheel
aa - ang acc

u have to find value of mag of st fric..which satisfies the above eqn....

but tht " expert " cooly substituted friction as mu * N
which is WRONG!!!.....how do u know maximum friction acts??/
see...............

so question is WRONG....INFORMATION INADEQUATE!!!!!!!!!!!!!!!!!!!!!!

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