what is Newton's second law of motion proof first law of motion using second law
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Newton's Second Law of Motion
Newton's second law of motion states that the acceleration (a) experienced by an object is directly proportional to the net force (Fnet) experienced by the object and inversely proportional to the mass of the object. In equation form, it could be said that a = Fnet/m. The net force is the vector sum of all the individual force values. If the magnitude and direction of the individual forces are known, then these forces can be added as vectors to determine the net force. Attention must be given to the vector nature of force. Direction is important. An up force and a down force can be added by assigning the down force a negative value and the up force a positive value. In a similar manner, a rightward force and a leftward force can be added by assigning the leftward force a negative value and the rightward force a positive value.
The a = Fnet/m equation can be used as both a formula for problem solving and as a guide to thinking. When using the equation as a formula for problem solving, it is important that numerical values for two of the three variables in the equation be known in order to solve for the unknown quantity. When using the equation as a guide to thinking, thought must be given to the direct and inverse relationships between acceleration and the net force and mass. A two-fold or a three-fold increase in the net force will cause the same change in the acceleration, doubling or tripling its value. A two-fold or three-fold increase in the mass will cause an inverse change in the acceleration, reducing its value by a factor of two or a factor of three.
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Newton's Second Law of Motion
Newton's second law of motion states that the acceleration (a) experienced by an object is directly proportional to the net force (Fnet) experienced by the object and inversely proportional to the mass of the object. In equation form, it could be said that a = Fnet/m. The net force is the vector sum of all the individual force values. If the magnitude and direction of the individual forces are known, then these forces can be added as vectors to determine the net force. Attention must be given to the vector nature of force. Direction is important. An up force and a down force can be added by assigning the down force a negative value and the up force a positive value. In a similar manner, a rightward force and a leftward force can be added by assigning the leftward force a negative value and the rightward force a positive value.
The a = Fnet/m equation can be used as both a formula for problem solving and as a guide to thinking. When using the equation as a formula for problem solving, it is important that numerical values for two of the three variables in the equation be known in order to solve for the unknown quantity. When using the equation as a guide to thinking, thought must be given to the direct and inverse relationships between acceleration and the net force and mass. A two-fold or a three-fold increase in the net force will cause the same change in the acceleration, doubling or tripling its value. A two-fold or three-fold increase in the mass will cause an inverse change in the acceleration, reducing its value by a factor of two or a factor of three.
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Newton's first law of motion states that a body at rest will remain at rest and body in motion will remain in motion in staright line with a uniform speed, unless an external force acts on it. In this way, we can derive Newton's first law of motion from Newton's second law of motion.
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