First slide

Different types of Forces

Question

Two blocks are in contact on a frictionless table. One has mass m and the other 2 m. A force F is applied on 2m as shown in the figure. Now, the same force F is applied from the right on m. In the two cases, the ratio of force of contact between the two blocks will be

Easy

A

same
B

1 : 2
C

2 : 1
D

1 : 3

Solution

Acceleration in both the cases will be same.
$N_{1} = m a, but N_{2} = (2 m) a$
$∴ \frac{N_{1}}{N_{2}} = \frac{1}{2}$

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