5.3 Newton's Second Law - University Physics Volume 1 | OpenStax

Newton’s second law is closely related to his first law. It mathematically gives the cause-and-effect relationship between force and changes in motion. Newton’s second law is quantitative and is used extensively to calculate what happens in situations involving a force. Before we can write down Newton’s second law as a simple equation that gives the exact relationship of force, mass, and acceleration, we need to sharpen some ideas we mentioned earlier. First, what do we mean by a change in motion? The answer is that a change in motion is equivalent to a change in velocity. A change in velocity means, by definition, that there is acceleration. Newton’s first law says that a net external force causes a change in motion; thus, we see that a net external force causes nonzero acceleration. We defined external force in Forces as force acting on an object or system that originates outside of the object or system. Let’s consider this concept further. An intuitive notion of external is correct—

5.3 Newton's Second Law - University Physics Volume 1 | OpenStax Skip to Content Go to accessibility page Keyboard shortcuts menu University Physics Volume 1 5.3 Newton's Second Law University Physics Volume 1 5.3 Newton's Second Law Contents Highlights Print Close 5.3 Newton's Second Law By the end of this section, you will be able to: Distinguish between external and internal forces Describe Newton's second law of motion Explain the dependence of acceleration on net force and mass Newton’s second law is closely related to his first law. It mathematically gives the cause-and-effect relationsh

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