This law is important in analyzing problems of static equilibrium, where all forces are balanced, but it also applies to bodies in uniform or accelerated motion. The third law is also known as the law of action and reaction. Newton’s third law states that when two bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction. Newton’s third law: the law of action and reaction Conversely, if a body is not accelerated, there is no net force acting on it. If a body has a net force acting on it, it is accelerated in accordance with the equation. For a body whose mass m is constant, it can be written in the form F = m a, where F (force) and a ( acceleration) are both vector quantities. Newton’s second law is one of the most important in all of physics. A force applied to a body can change the magnitude of the momentum or its direction or both. Momentum, like velocity, is a vector quantity, having both magnitude and direction. The momentum of a body is equal to the product of its mass and its velocity. It states that the time rate of change of the momentum of a body is equal in both magnitude and direction to the force imposed on it. Newton’s second law is a quantitative description of the changes that a force can produce on the motion of a body. Learn how immovable objects and unstoppable forces are the same See all videos for this article SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.
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