Question

i) Frictional force is said to be a contact force.
ii) We use fossil fuels only when absolutely
necessary.
iii) Farmers carry out levelling of the ploughed
fields.
Give reasons for the following​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

1.The force which always opposes the motion of one body over another body frictional force. It acts between the two surfaces which are in contact with each other. ... Since frictional force arises when the surface of two objects are in touch with each other ,therefore, frictional force is an example of contact force.

2.The burning of fossil fuels is the main cause of air pollution. On burning, these produce harmful gases like carbon monoxide, sulfur dioxide, etc and cause global warming in the atmosphere. Then this leads to depletion of the ozone layer. Hence we should use fossil fuels only when absolutely necessary.

3.The levelling of ploughed fields prevents the top fertile soil from being carried away by strong winds or washed away by rain water. The levelling of ploughed fields helps in the uniform distribution of water in the fields during irrigation. The levelling of ploughed fields helps in preventing the loss of moisture.

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