Newton's Three Laws of Motion

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AS and A Level Science
Newton's Three Laws of Motion Isaac Newton was born on Christmas day in 1642, in Lincolnshire, England. Newton attended Trinity College in 1661 and had both his Bachelor of Arts and his Master of Arts by 1669. That same year he became the associate of the French Academy of Sciences. He was elected to
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Parliament, and then appointed a warden, and finally, President of the Royal Society. Newton was a Master of Science and mathematics. He discovered calculus, before Leibniz' became popular. Perhaps Newton's most popular discovery, though, was gravity. As the story goes, Sir Isaac Newton was resting under a tree one day in his garden, when an apple fell from it and hit him on the head. Thus, he discovered gravity. The earth's gravitational pull pulls objects toward it. However, many people believe that this is only a myth created to simply illustrate Newton's discovery. Along with Newton's many discoveries, the three ...

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Level of analysis

The essay is fluent and the candidate uses a suitable language, there is also no real issue with spelling or grammar. However the essay is scientifically poor because at this level I would expect physics terms to be used correctly which they are not.

Response to question

The initial introduction is good. I like that the candidate has undergone independent research and clearly discusses Newton’s background. However there are fundamental errors when discussing Newton’s laws of motion, therefore the response to the set topic is fairly poor. This could be improved by adjusting several statements and by the use of correct terminology. My advice would be revaluate the statements of Newtonian laws and provide examples of each. In addition a higher grade could be achieved by discussing experiments that show or determine Newton’s laws of motion. Unfortunately there are several scientific errors though out this essay. The candidate incorrectly interrupts the term inertia which actually describes an objects reluctance to move due to its physical mass. The candidate does not successfully state Newton’s three laws, the first law states that; 'An object will remain at rest for continue to travel at constant velocity unless an external force is acting'. The candidate attempts to state the second law of 'Force is directly proportional to acceleration' but it is only true if the mass of the object doesn’t change. Einstein's special theory of relativity also proves this law to be false when objects are travelling close to the speed of light. Newton’s second law should be stated as; 'The net force acting on an object is directly proportional to the rate of change of linear momentum provided the net force and the change of momentum are in the same direction'. At this level the candidate is expected to understand the law in the following way; 'If object A exerts a force on object B, then object B exerts a force on object A that is of equal magnitude, in the opposite direction and is of the same type.'

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