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21 Σεπ 2015 · Is it correct to say that the equation derived from Newton's second law is the net force, as opposed to the former (the one derived from impulse) average force? Would the average net force be $$F= \frac{m(v_1 + v_2)}{\Delta t} + mg$$
The net force concept is critical to understanding the connection between the forces an object experiences and the subsequent motion it displays. In this Lesson, The Physics Classroom describes what the net force is and illustrates its meaning through numerous examples.
From the equation, we see that the impulse equals the average net external force multiplied by the time this force acts. It is equal to the change in momentum. The effect of a force on an object depends on how long it acts, as well as the strength of the force.
The second law is a description of how a body responds mechanically to its environment. The influence of the environment is the net force →Fnet, the body’s response is the acceleration →a, and the strength of the response is inversely proportional to the mass m.
The BIG Equation. Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
In equation form, this is W net = F net d cos θ where θ is the angle between the force vector and the displacement vector. Figure 7.3 (a) shows a graph of force versus displacement for the component of the force in the direction of the displacement—that is, an F cos θ vs. d graph. In this case, F cos θ is constant.
Define impulse. Describe effects of impulses in everyday life. Determine the average effective force using graphical representation. Calculate average force and impulse given mass, velocity, and time. The effect of a force on an object depends on how long it acts, as well as how great the force is.
