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Learn how to predict the translational motion of objects using Newton's first and second laws.
Newton's second law explains how force, mass, and acceleration are related in physics.
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Learn about forces and Newton's laws of motion with Khan Academy's comprehensive lessons and resources.
Check your understanding of Newton’s second law in this set of free practice questions aligned to AP Physics I standards.
Also called the law of inertia, this is the most important thing to realize about motion.
Newton's first law states that objects move with constant velocity unless acted upon by an unbalanced force. If the net force on an object is zero, it will remain at rest (if already at rest) or continue moving with constant speed and direction.
Overview of the key terms, equations, and skills related to rotational inertia, including how to analyze rotation inertia and how it relates to Newton's second law.
Newton's second law of motion states that F = ma, or net force is equal to mass times acceleration. A larger net force acting on an object causes a larger acceleration, and objects with larger mass require more force to accelerate.
The equation F → net Δ t = Δ m v → is thus often referred to as the impulse-momentum theorem in many textbooks. Internal forces do not affect the momentum of the system. Because of Newton’s Third law, the forces acting between masses within a system cancel in pairs and do not contribute to the system’s momentum.