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Question
Which of the following blocks will not experience any frictional force on application of external force(s) on it?
Which of the following blocks will not experience any frictional force on application of external force(s) on it?
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Solution
The correct option is D
Frictional force comes into play only if the net force acting on a body is non zero.
Here, in case of block S, two forces of 5 N each, are being applied on the block from both sides. Both the forces will cancel each other as they are equal in magnitude but opposite in direction, resulting in zero net force on the block.
Due to zero net force, the block will not experience any frictional force.
On the remaining three blocks, the net force on the block is not zero. Therefore, remaining blocks will experience frictional force.
Frictional force comes into play only if the net force acting on a body is non zero.
Here, in case of block S, two forces of 5 N each, are being applied on the block from both sides. Both the forces will cancel each other as they are equal in magnitude but opposite in direction, resulting in zero net force on the block.
Due to zero net force, the block will not experience any frictional force.
On the remaining three blocks, the net force on the block is not zero. Therefore, remaining blocks will experience frictional force.
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