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Newton's First Law. Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion.

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

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(The tendency of objects to resist changes in motion was what Johannes Kepler had called inertia.) This insight was refined by Newton, who made it into his first law, also known as the "law of inertia"—no force means no acceleration, and hence the body will maintain its velocity.

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The associated SI unit of force and weight is the Newton, with 1 kilogramweighing 9.8 Newtons under standard conditions on the Earth's surface.

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Newton's law of universal gravitation ↑ Newton's law of universal gravitation states that every mass attracts every other mass in the universe, and the gravitational force between two bodies is proportional to the product of their masses, and inversely proportional to the square of the distance between them.

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An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

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A force will cause a change in velocity; and likewise, a change in velocity will generate a force. The equation works both ways. The third law states that for every action (force) in nature there is an equal and opposite reaction.

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One Newton is defined as the amount of force required to give a 1-kg mass an acceleration of 1 m/s/s.

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The coefficient of kinetic friction between this mass and the plane is 0.25. The forces on the hanging mass, m₁, are just as they were before: But the forces on the other mass, m₂, which sits on the plane now have a friction force to be included: Now we apply Newton's Second Law to these forces acting on mass m₂.

friction slows down a box from going down.

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These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects.

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Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. Thesecond law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.

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An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.