By Alicia Jones

and

Taylor Sayles

History of Newton’s Laws• Sir Isaac Newton was born in

Lincolnshire, England on December 25, 1643.

• He was a physicist, mathematician, astronomer, and philosopher.

• He had ideas about motion, gravity, the diffraction of light, and forces.

• His accomplishments laid the foundations for modern science and revolutionized the world.

Newton’s First Law

An object at rest will remain at rest unless acted on by an unbalance force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

* This law is often called “the law of inertia”

Newton’s First Law (cont.)

Centripetal Force:• The force acting upon a body moving

along a curved path that is directed toward the axis of rotation of the path and constrains the body to the path.

*Centripetal Force=massxvelocity^2/radius

or for dummies…• The inward force on a body moving in a

curved path around another body.

Newton’s Second Law

Acceleration is produced when a force acts on a mass. The greater the mass the greater the amount of force needed.

*FORCE=MASS x ACCELERATION

Newton’s Second Law (cont.)

Newton’s Third Law

For every action there is an equal and opposite reaction.

Newton’s Third Law (cont.)

• Forces always come in pairs - equal and opposite action-reaction force pairs.

• Newton’s third law always involves more than one object because if two equal and opposite forces act on the same object, they will cancel each other out so that no acceleration or motion occurs.

Interesting Facts!

• Sir Isaac Newton presented his three laws of motion in the “Principia Mathematica Philosophiae Naturalis.”

• Newton(N) is the SI unit for force.

• If there is more than one force acting on an object, the forces add up and appear to the object as one force called the net force.

Interesting Facts Continued

• Acceleration is directly proportional to the magnitude of the force.

• Acceleration is inversely proportional to the mass of the object.

THANK YOU!!