Physics

Problem

Three blocks

M

(

1\,\text{kg}

N

(

2\,\text{kg}

) and

R

(

3\,\text{kg}

) are arranged in this order from left to right on a horizontal surface for which the coefficient of kinetic friction is

0.10

. A horizontal force of

30\,\text{N}

is applied to

M

toward the right so that all three move together. Take

g = 10\,\text{m\,s}^{-2}

. Find the magnitude of the contact force between blocks

N

and

R

while the system is accelerating.