Which of the following is not an example of normal reaction force?

Iron nails sticking to a magnet.

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An apple falling from a tree.

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A book placed on a table.

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A ball rolling on an inclined plane.

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Solution

The correct option is B
An apple falling from a tree.

In case of an apple falling from a tree, there is no contact between the two bodies in the problem (i.e. apple and the ground). So there is no normal reaction force.

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Which of the following is not an example of normal reaction force?

The correct option is B An apple falling from a tree. In case of an apple falling from a tree, there is no contact between the two bodies in the problem (i.e. apple and the ground). So there is no normal reaction force.

The correct option is B
An apple falling from a tree.

In case of an apple falling from a tree, there is no contact between the two bodies in the problem (i.e. apple and the ground). So there is no normal reaction force.