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Newton's second law of motion states that force is equal to that object's mass multiplied by its acceleration, or f=ma.
This explains how the velocity of an object changes when it is subjected to an external force. The law defines a force to be equal to change in momentum (mass times velocity) per change in time.
Newton's Laws of Motion:

Newton's laws of motion - Wikipedia

en.wikipedia.org/wiki/Newton's_laws_of_motion

Law II: The alteration of motion is ever proportional to the ... with Newton's commentary on the second law of motion, ...

Newton's Second Law of Motion

teachertech.rice.edu/Participants/louviere/Newton/law2.html

Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to ...

Newton's Second Law - The Physics Classroom

www.physicsclassroom.com/class/newtlaws/Lesson-3/Newton-s-Second-Law

Newton's first law of motion predicts the behavior of objects for which all existing forces are balanced. The first law - sometimes referred to as the law of inertia ...

Newton's second law of motion (video) | Khan Academy

www.khanacademy.org/science/physics/forces-newtons-laws/newtons-laws-of-motion/v/newton-s-second-law-of-motion

Newton's second law of motion is F = ma, or force is equal to mass times acceleration. Learn how to use the formula to calculate acceleration.

Newton's Second Law of Motion - Space Flight Systems - NASA

spaceflightsystems.grc.nasa.gov/education/rocket/newton2r.html

Sir Isaac Newton first presented his three laws of motion in the "Principia Mathematica Philosophiae Naturalis" in 1686. His second law defines a force to be ...

Newton's Second Law of Motion - NASA

www.grc.nasa.gov/www/k-12/airplane/newton2.html

Sir Isaac Newton first presented his three laws of motion in the "Principia ... Newton's second law can help us determine the new values of V1 and m1, if we know ...

Force, Mass & Acceleration: Newton's Second Law of Motion

www.livescience.com/46560-newton-second-law.html

Jun 26, 2014 ... Newton's Second Law of Motion states, “The force acting on an object is equal to the mass of that object times its acceleration.”

www.ask.com/youtube?q=Newton's Second Law of Motion&v=ZvPrn3aBQG8
Apr 17, 2015 ... You will learn about "Newton's 2nd law of motion" in this video. Newton's 2nd law states that the rate of change of momentum of an object is ...

Newton's Laws - HyperPhysics

hyperphysics.phy-astr.gsu.edu/hbase/Newt.html

Any change in motion involves an acceleration, and then Newton's Second Law applies; in fact, the First Law is just a special case of the Second Law for which ...