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.
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.
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There are mainly six types of simple machines a) wheel and axle b) inclined plane c) wedge d) lever e) pulley f) screw
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 .