Tuesday, April 26, 2011

Forces and Motion


        What a tiring day today,right? Well, for me it was. I just found out that my class will be learning about Forces and motion, this might not seem very interesting to you, but to me it is very exciting because we learned this in 4th grade in Munich International School. Forces and motion pretty much concentrate on gravitational forces and pressure also compared to motives for movement happening. What are somethings that I know? First of all, something you should know as well, are the 3 newton laws. Who the Heck is Newton? Sir Isaac Newton was born on 1642 in a manor house in Lincolnshire, England. He was interested in science and was known as a famous Mathematician and Scientist. He invented the 3 newtons laws of motion. These laws tell how objects move and the reason for these. The 3 laws are:
1.Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. 
2. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.
3. For every action there is an equal and opposite reaction.
        All of these laws connect to gravity and mass because those are the key things that tell you your force. What the first law is trying to explain is that an object will not start moving until it is pushed, pulled or touched by an external force. An external force is a force that is not caused by the object itself but something happening to it from the outside. External forces include the applied force, normal force, tension force, friction force, and air resistance force and the internal forces include the gravity forces, magnetic force, electrical force, and spring force. The second law is practically explaining how you can compare the mass, force and acceleration, forming a formula. Lastly, the 3rd law says how every action and thing happening to an object, so every force, will have a reaction of its own and may react equally or oppositely to different things.
   In my old school, we have done this unit in 4th grade, so I am informed about most stuff, but I would like to learn everything again because I don’t remember a lot of the things we did. Some activities we did were for example getting on the balcony in groups, and we would have different objects and mass units also including forces and we would try to give our own definition for every single law. The only thing I can really remember is that we would have some wood or cars on wheels, and push the objects against each other and see the reactions. So after all, I am eager to find out how this forces and motion will be compared to my old one and see all the differences. But most of all, I am excited to learn new things because this unit is one of the most exciting ones.

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