Notes_Newton2ndlaw

Notes_Newton2ndlaw - Newton's 2nd Law 2D Particle Kinetics...

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Newton’s 2nd Law – 2D Particle Kinetics Force Interaction between a body and its environment; action of one body on another. Force is a vector characterized by magnitude, direction, and the point of application. Superposition of forces: 123 1 2 3 1 2 3 , x xxxx y yyyy RF F F F R F FFF R F =Σ = + + + = + + + = + + + GG G G G """ R G is called the resultant, the total force, or the net force, which has the equivalent mechanical effect as the combination of the individual forces. Newton’s laws of motion 1. Newton’s first law (law of inertia): A body will remain its state of motion if and only if there is no net force acting on it: 0 0 constant equilibrium Fa υ Σ=⇔=⇔= G G G If the body is initially at rest, it will remain at rest. If the body is in motion, it will move with constant velocity. Inertia: the tendency of the body to remain its original state of motion, the resistance to change of motion. Inertial frame of reference is a non-accelerating coordinate system in which Newton’s 1st law is valid. 2. Newton’s second law: The acceleration of a body has the same direction as the net force. Its
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Notes_Newton2ndlaw - Newton's 2nd Law 2D Particle Kinetics...

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