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Question & Answer
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An object at rest will stay at rest unless acted upon by an unbalanced force.
The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
For every action, there is an equal and opposite reaction.
The velocity of an object can change without any external force acting on it.
Understanding the Answer
Let's break down why this is correct
An object that is not moving will stay still, and one that is moving keeps going at the same speed and direction unless something pushes or pulls on it. Other options are incorrect because This answer mixes the second law, which talks about acceleration caused by force; This describes Newton's Third Law, which deals with forces between two objects.
Key Concepts
Classical Mechanics Principles
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Deep Dive: Classical Mechanics Principles
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Definition
Classical mechanics principles cover Newton's Laws, the Principle of Least Action, Euler-Lagrange equations, and Hamilton's equations. It provides a foundational understanding of the classical state of physical systems and their behavior.
Topic Definition
Classical mechanics principles cover Newton's Laws, the Principle of Least Action, Euler-Lagrange equations, and Hamilton's equations. It provides a foundational understanding of the classical state of physical systems and their behavior.
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