A block of mass m sits atop a mass M which rests on a frictionless table.
The coeffecient of friction between the two masses is
The mass M is connected to a spring of force constant k attached to the wall.
(i) How far can mass M be pulled so that upon release, the upper mass m does not slip off? (ii) Repeat if s the coeffecient of friction between M and the table.
im getting bit confused about the signs.
for big+small block we have upon release
for small block
now as big block goes back upon release then does small block move opposite way so friction acts in same direction as acc?
so as we want max x we need
but answers negate the Lhs. Why is this?
for part (ii) for the big block with friction the answers have
but once again should the friction not be in opposite direction to acc of the block?