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Question

# A block weighing 30 N is on a smooth horizontal surface and it is accelerated in the horizontal direction at a rate of 4 m/s2 by a force. The net force in horizontal direction acting on the block is (g =10m/s2 ):

A
12 N
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B
120 N
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C
50 N
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D
10 N
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Solution

## The correct option is A 12 NWeight of the block W=mg N is the normal reaction acting on the block due to the horizontal surface (mg is downward and N is upward)So N=mg as there is no acceleration in vertical direction.The net force experienced by the block will be in the horizontal direction and will be equal to the product of mass and acceleration.Mass: m=Wg=30 N10 m/s2=3kgHence, by Newton's second law of motion,Force F=ma=3 kg×4 m/s2=12 N

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