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Standard XII

Physics

Ropes

A horizontal ...

Question

A horizontal force $F$ pushes on a $4 k g$ block (A) which pushes against a $2 k g$ block (B) as shown in the figure. The blocks have an acceleration of $3 m / s^{2}$ to the right. There is no friction between the blocks and the surfaces on which they slide. What is the net force B exerts on A?

6 N to the right

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12 N to the right

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6 N to the left

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12 N to the left

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Solution

The correct option is B 6 N to the left
When a force is applied to the block A and they move with a common acceleration $a$ , then A block exerts force on block B.
According to Newton's third law, block B also exerts same reaction force( $R$ ) to the A.

From FBD we get, for block B:
$R = M_{B} a = 2 \times 3 = 6 N$ to left

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A horizontal force F pushes on a 4kg block (A) which pushes against a 2kg block (B) as shown in the figure. The blocks have an acceleration of 3m/s2 to the right. There is no friction between the blocks and the surfaces on which they slide. What is the net force B exerts on A?

The correct option is B 6 N to the leftWhen a force is applied to the block A and they move with a common acceleration a, then A block exerts force on block B. According to Newton's third law, block B also exerts same reaction force(R) to the A. From FBD we get, for block B: R=MB a=2×3=6 N to left

A horizontal force $F$ pushes on a $4 k g$ block (A) which pushes against a $2 k g$ block (B) as shown in the figure. The blocks have an acceleration of $3 m / s^{2}$ to the right. There is no friction between the blocks and the surfaces on which they slide. What is the net force B exerts on A?