Subject :NSO Class : Class 4
Subject :NSO Class : Class 5
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Subject :NSO Class : Class 5
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Subject :NSO Class : Class 5
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Subject :NSO Class : Class 5
Ans 1:
Class : Class 5
We cannot walk on ice because of reduced frictional force.Ice is also very smooth. Smooth surfaces have reduced friction while rough surfaces have a lot of friction.Friction is also known as a necessary evil because it is very necessary in life but causes harm in form of wear and tear. It also produces heat. Some good examples of friction are:
a) rubbing of hands
b) ball stops after moving for a while
Ice skaters have special blades for skating on ice. There skates have blades that cut the ice and make a strong grip to let them skate.
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Subject :NSO Class : Class 5
Ans 1:
Class : Class 5
Whenever we throw a ball up in the air, it falls back to the ground . This is because of a force called gravitational force or gravity.This is the force in which all the objects are pulled towards the earth. Sir Isaac Newton was the first man to discover it.
Ans 2:
Class : Class 6
The pull of the Earth is called gravitational force. eg are the coming down of a ball
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Subject :NSO Class : Class 5
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Subject :NSO Class : Class 6
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Class : Class 5
Invent means "create or design [something that has not existed before ]". According to the recent history Vasco da Dama was the first European to reach India by sea linking Europe and Asia for the first time ocean route , was accomplished on his first voyage to India .[1497-1499] , so you can say that he discovered India .
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Subject :NSO Class : Class 7
Ans 1:
Class : Class 8
Ferrel's law is the law that wind is deflected to the right in the Northern hemisphere and to the left in southern hemisphere.
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Subject :NSO Class : Class 5