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CBSE Class 12-science Answered

Two blocks are in contact on a horizontal table. A horizontal force applied to one of the block. If m1=2 kg, m2= 1kg , and F =3 N  . Find the  force of contact between 2 blocks
Asked by Krishnapittu143 | 24 Jan, 2021, 09:31: PM
answered-by-expert Expert Answer
Figure shows the forces acting on 2kg and 1 kg block that are in contact. Applied force is F = 3 N . 
 
At contact surface, we are getting action-reaction pair of contact forces FC . Let the system moves with acceleration a.
 
Free body diagrams are shown for 2 kg block and 1 kg block.
 
If we apply Newton's second law to 2 kg block , we get , F - FC = 3 - FC  = 2a  ...................(1)
 
If we apply Newton's second law to 1 kg block , we get ,   FC = a  ...................(2)
 
By adding eqn.(1) and (2) , we get ,  (2a+a) = 3a = 3   or  a = 1 m/s2 
 
Hence from eqn.(1) , we get , Contact force FC = 1 N
Answered by Thiyagarajan K | 24 Jan, 2021, 11:00: PM

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