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Newtons First & Second Laws. by: Nayeli and Walter. Newtons First Law. describes motion produced by balanced forces.

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## Newtons First & Second Laws

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**Newtons First & Second Laws**by: Nayeliand Walter**Newtons First Law**describes motion produced by balanced forces.**Acceleration is produced when a force acts on a mass. The**greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).**Newton's second law of motion pertains to the behavior of**objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of object is increased, the acceleration of the object is decreased.**Newton's First Law of Motion states that an object in motion**tends to stay in motion unless an external force acts upon it. Similarly, if the object is at rest, it will remain at rest unless an unbalanced force acts upon it. Newton's First Law of Motion is also known as the Law of Inertia. Basically what Newton's First Law is saying is that objects behave predictably. If a ball is sitting on your table, it isn't going to start rolling or fall off the table unless a force acts upon it to cause it to do so. Moving objects don't change their direction unless a force causes them to move from their path.**When force is being added the object will move and change.**When the object is alone with NO force being added it will not speed up or slow down , it will stay the same**Newton's Second Law of Motion states that when a force acts**on an object, it will cause the object to accelerate. The larger the mass of the object, the greater the force will need to be to cause it to accelerate. This Law may be written as force = mass x acceleration or: F = m * a Another way to state the Second Law is to say it takes more force to move a heavy object than it does to move a light object.**There are two cars with different mass.The bigger car has**more mass then the smaller car so the bigger car will go faster.**Consistent with the first law, the time derivative of the**momentum is non-zero when the momentum changes direction, even if there is no change in its magnitude; such is the case with uniform circular motion. The relationship also implies the conservation of momentum: when the net force on the body is zero, the momentum of the body is constant. Any net force is equal to the rate of change of the momentum.**The two forces in Newton's third law are of the same type**(e.g., if the road exerts a forward frictional force on an accelerating car's tires, then it is also a frictional force that Newton's third law predicts for the tires pushing backward on the road).**From a conceptual standpoint, Newton's third law is seen**when a person walks: they push against the floor, and the floor pushes against the person. Similarly, the tires of a car push against the road while the road pushes back on the tires—the tires and road simultaneously push against each other

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