question_answer

Three blocks of mass 1 kg, 4 kg and 2 kg are placed on a smooth horizontal plane as shown in figure. Find (a) The acceleration of the system. (b) The normal force between 1 kg block and 4 kg block. (c) The net force on 2 kg block.

Answer:

(a) Resultant force on the system = 70 N towards right\[7a=70\Rightarrow \,\,\,a=10m/{{\sec }^{2}}\] (b) Draw the free body diagram 1kg block Resultant force on 1 kg block \[=(120-N)\] \[\Rightarrow (120-N)=(1)10N\Rightarrow 110\]newton. (c) The net force on 2kg block. \[{{F}_{net}}\] = (mass of 2kg block) × acceleration \[=2\times 10=20N.\]