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unit 2 forces
forces: an interaction between two objects that result in a push or pull. important concepts to remember: newton’s first law newton’s second law newton’s third law system schemas and force diagrams force calculations motion and force models DEFINITIONS: newton’s first law: states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion. newton’s second law: 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. newton’s third law: A force is a push or a pull that acts upon an object as a results of its interaction with another object. These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction. system schemas: useful representational tool for capturing important elements about the system we are trying to describe. It is easiest to understand the system schema by using an example to draw upon. The situation below will provide a context for drawing the system schema, and for representing a force diagram. force diagrams: A force diagram is simply a diagram showing all the forces acting on an object, the force's direction and its magnitude. It is a simplification of the picture that shows just the forces. |
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