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here are some shortcuts to find ............... in motion in 1 dimension 1) to find the vel. in b/w the distance travelled V1 = {v2 + (v2 - u2/n)}1/2 2) a bullet is fired with certain vel. into a block of wood . it loses 1/nth of its initial speed after travelling a dist. x in the block . determine the total dist. penetrated by it before coming to rest.... ans) x' = {N2/ 2n - 1} x &nbs
Comments (58)
all i can tell u is this:
the 1st thing to remember in fbd's is show all the forces "acting" on the body.
not those which the body applies on others.
2nd thing, resolve the forces in 2 directions, one parallel to the resulatant acceleration n the second direction obviously perpendicular to the resultant acceleration.
3rd thing is never show the resultant force, it causes confusion(u may accidentally take it as one of the forces on the body on LHS of an equation, when it should be on RHS). just show the direction of resultant acceleration. lyk write "a" and mark an arrow in its direction instead of "ma".
that should be it..:) cheers
FR ANGLE # AND pi/2 - #
T1 (for $) * T2 (for pi/2 - $ ) = 2R/g (not T1 + T2 = 2R/G)
i can prove this,......
!!!!!!!!!!!
Good going guyz… 
Renewing this thread
Here r some formulae from Rotation …
For a body rolling down an inclined plane (inclined at angle @) nd having radius R ( and K = radius of gyration )
accl = a = g sin@ / ( 1 + K2/R2 )
frictional force = mg sin@ / ( 1 + R2/K2 )
and to start pure rolling,
coeff. of static friction shud be gr8er than or equal to tan @ / ( 1 + R2/K2 )
So, when u have a rolling body of same mass and radius ….
Acceleration is of d order
a sphere > a disc > a shell > a ring
but the time taken will be in order
t sphere < t disc < t shell < t ring
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