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This essay represents a unique assignment done in an 8th grade science class. The students watched a bicycle demonstration on video created by their teacher that demonstrated Newton's Laws of Motion. As one of their assignments they wrote an essay that demonstrated that they understood the principles.
In the 18th century, a scientist named Sir Isaac Newton discovered three laws of motion. These laws are important because they explain why things move or stay at rest. Newton's first, second, and third laws all apply when one is riding a bicycle.
Newton's first law says that an object in motion tends to stay in motion and an object at rest tends to stay at rest unless an unbalanced force acts on it. This means an object will keep doing what it is doing unless something makes it change its motion. This law is also called the Law of Inertia. Inertia is the tendency for an object to stay in motion. When you are riding a bicycle, you will not move unless you push down on the pedal. If you stop pedaling, you will stop because of the friction on the road and tire and air resistance. If it weren't for these forces, you would continue to move forever in the same direction. Therefore, in order to change motion, an unbalanced force needs to act on an object.
Next, Newton's second law of motion explains that force is directly proportionate to mass and acceleration. Force equals mass times acceleration (F = ma). This means that if an object has a lot of mass, more force will be needed for that object to accelerate at the same rate as an object with less mass. When riding a bicycle, a certain amount of force is needed to make it go. If you add another person to the bicycle, even more force needs to be exerted to make the bike move. Also, if you want to go faster, even more force needs to be applied. Hence, when an object has more mass more force needs to be applied to that object in order to make it go faster.
Finally, Newton's third law explains that for every action there is an equal and opposite reaction. For example, a book is sitting on a desk. Gravity is pushing down on it and normal force is pushing back up on it. When you are on a bike, the tire is pushing into the ground. The ground's reaction is to then push up against the tire. This chain reaction makes the bike move. So, Newton's third law is needed for objects to be able to move.
In conclusion, these three laws all apply when one is riding a bicycle. We need to know about these laws because we need to understand why objects move or stay at rest.
Using the mobile set of lap tops, students created powerpoints in math class defining 4 types of angles (complementary, supplementary, adjacent and vertical) and identifying them in the real world.
Students in both Level I Spanish classes have an "amigo de correspondencia" (a penpal) to whom they communicate with via postcards over the entire year. The students in one class write to the students in the other class using a "nombre secreto" so as to conceal their true identity. Postcards are written with specific requirements, are tied to the content in the unit and a 12 point rubric.