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1] what is a force?what changes can be produced by a force ?

2] why do tools meant for cutting always have sharp edges ?
3] do you agree with the statement, "friction is both good and evil" ? explain with examples.
4] what is thermoplastic and thermosetting plastic?


Force is interaction which changes state of the object. when force is applied then there can b change in state, nature, position, direction.
objects for cutting have sharp  edges so that force falls over very small area creating gr eater pressure making it easy to cut.
s i do agree. friction hepls us to walk and on the other hand also tears away the soles of shoes . 

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