Question

plzz some help me to understand laws of Motion class 9

Answer 1

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Newton Laws for science are condered a breakthrough in 1678,although there were kipler laws and Galilieo laws be fore him but his laws of motion and gravity were a revolution in science at that time.His gravity theory which,as history tells us,inspired to him bu a falling apple from the tree,has lead him to study the motion of the moon and other planets.On this observation he posulated the following verified laws:
1-Any object is moving uniformaly if no external force affects it.
2-for each action there is an action equals to it and opposite in direction
3- Any moving object moving non uniformly under an effect of force given by F=ma
where m is the mass of the object and a is its acceleration given by the time rate change of its velocity i.e. dv/dt.
4- Gravity force between two masses seperated by distance d is given by Fg=GMm/d^2
Where G is Newton constant,it is aniversal constant.So these laws were the bases of classical physics for about320 years,but when the phenomena of the quantum physics appears 1900 ,thes laws found to a limit to quantum physcs and general relativity when
 h---->0 and V<<C.But still Newton`s laws considered a great revolution in the science history in deed.




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Answer 2

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