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Space Travel

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Submitted By jubby
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Isaac Newton is considered by many to be the most influential scientist that ever lived. His theories and laws surround us in everyday life and have built the basis for the study of physics. One of his main focuses as a scientist was the relevance of forces and motion in everyday life. He has come up several laws regarding motion and they have been used in helping mankind to get as far as they have with understanding physics. Space travel is possible because of the theories that Newton provided us with and you can see that in the movie Apollo 13, which retells a story of three astronauts who use mainly the laws of physics to get back to Earth after their space shuttle is damaged from an explosion. In the following paragraphs I will provide some examples from the movie of Newton’s first law, third law and his law of universal gravitation.

Newton’s first law otherwise known as the law of inertia, states that an object at rest will continue to stay at rest and an object in motion will continue to stay in motion unless acted on my an external force. This law is shown throughout the entire movie when the space ship is in outer space. Due to the lack of gravity outside of the Earth’s atmosphere, the space craft moves in uniform motion in the same direction unless acted on by another force such as meteors or the rocket boosters.

The third law that Isaac Newton produced states that for every action force there is an equal and opposite reaction force. An example to represent this law can be seen when the astronauts use the rocket engines to shoot out gas molecules. These gas molecules are shot out of the back of their shuttle and as stated by Newton’s law, their must be an equal and opposite reaction force which is used to accelerate the space shuttle.

Another one of Newton’s laws states that any two objects in the universe exert gravitational forces of equal

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